the present system is a shell that is capable of preventing removal of a trailer coupler from a tongue of a trailer by preventing access to a coupler bolt that removably connects the trailer coupler to the tongue of the trailer . with use of the present system , a user can still access a hitch of the coupler , however , access to a ball socket of the coupler is also prevented . interaction of the present system with a trailer coupler is described in detail herein . fig2 is a back top perspective view of the present system 200 in a closed state , in accordance with a first exemplary embodiment of the invention . in addition , fig3 is a front top perspective view of the system 200 of fig1 , also in a closed state . further , fig4 is a front top perspective view of the system 200 of fig1 , but instead in an open state , while fig5 is a front top perspective view of a first arm of the system 200 and fig6 is a front top perspective view of a second arm of the system 200 . still further , fig7 is a front bottom perspective view of the system 200 of fig1 . it should be noted that the shapes provided by fig2 - 7 are provided for exemplary purposes . one having ordinary skill in the art would appreciate that alternative shapes may be used in accordance with the present invention , and such shapes are intended to be covered by the present disclosure . as an example , the present system 200 is shown as being beveled , although the system 200 may instead not be beveled . in addition , outer sides of the system 200 may instead be a different shape , as long as a trailer coupler is capable of being secured therein , as described in detail below . referring to fig2 - 7 , the system 200 contains a first arm 210 and a second arm 250 . the first arm 210 is rotatably connected to the second arm 250 via a hinge 202 . while fig2 illustrates an outside portion of the hinge 202 , fig4 illustrates the hinge 202 from inside of the system 200 . it should be noted that the hinge 202 may be any known hinge that is capable of joining two portions , while also providing rotational capability . preferably , the hinge 202 is also strong enough to prevent tampering with the hinge 202 or removal of the hinge 202 . the hinge 202 is connected to a distal portion 212 of the first arm 210 and a distal portion 252 of the second arm 250 , thereby allowing the system 200 to open and close by separating and closing distance between a proximate portion 214 of the first arm 210 and a proximate portion 254 of the second arm 250 . specifically , the hinge 202 acts as an axis of rotation for the system 200 . the first arm 210 of the system 200 contains a top portion 220 , a side portion 222 , a bottom portion 224 , a back portion 226 , and a front portion 228 . the first arm 210 is concave in shape , where the top portion 220 , the side portion 222 , the bottom portion 224 , the back portion 226 , and the front portion 228 define the concave shape . likewise , the second arm 250 of the system 200 contains a top portion 260 , a side portion 262 , a bottom portion 264 , a back portion 266 , and a front portion 268 . the second arm 250 is concave in shape , where the top portion 260 , the side portion 262 , the bottom portion 264 , the back portion 266 , and the front portion 268 define the concave shape . as is explained in more detail below , the concave shape of the first arm 210 and the concave shape of the second arm 250 allows the first arm 210 and the second arm 250 to be closed around a trailer coupler 100 ( fig1 ), such as the trailer coupler 100 of fig1 . the purpose of the bottom portion 224 of the first arm 210 and the bottom portion 264 of the second arm 250 , and the shape of each bottom portion 224 , 264 is to prevent access to a ball socket 104 ( fig1 ) of a trailer coupler 100 ( fig1 ) when the system 200 is in a closed state around the trailer coupler 100 ( fig1 ), while providing ample spacing for running items such as , but not limited to , wiring . specifically , starting from the distal portion 212 of the first arm 210 , the bottom portion 224 , which extends in a plane perpendicular to a plane of the side portion 222 , contains a step 230 having a top surface 232 and a side surface 234 , where a plane of the side surface 234 extends perpendicular to a plane of the top surface 232 . a bottom surface 236 of the first arm step 230 extends in a plane perpendicular to the plane of the side surface 234 . similar to the first arm 210 , starting from the distal portion 252 of the second arm 250 , the bottom portion 264 , which extends in a plane perpendicular to a plane of the side portion 262 , contains a step 270 having a top surface 272 and a side surface 274 , where a plane of the side surface 274 extends perpendicular to a plane of the top surface 272 . a bottom surface 276 of the second arm step 270 extends in a plane perpendicular to the plane of the side surface 274 . the front portion 228 of the first arm 210 extends inward from the side portion 222 of the first arm 210 in a direction perpendicular to a plane of the side portion 222 of the first arm 210 . a first lip is created by the front portion 228 of the first arm 210 . in addition , the front portion 268 of the second arm 250 extends inward from the side portion 262 of the second arm 250 in a direction perpendicular to a plane of the side portion 262 of the second arm 250 . a second lip is created by the front portion 268 of the second arm 250 . when the system 200 is in the closed condition , as shown by fig2 , fig3 , fig5 , fig6 , and fig7 , the first and second lips of the system 100 prevent a trailer coupler 100 ( fig1 ) from being removed from a trailer tongue 150 ( fig1 ). specifically , the system 200 is fabricated to be slightly longer than the trailer coupler 100 ( fig1 ). as a result , when the system 200 is closed around the trailer coupler 100 ( fig1 ), the first and second lips of the system 200 surround an outer flange 120 ( fig1 ) of the trailer coupler 100 ( fig1 ). the purpose of the top portion 220 of the first arm 210 and the top portion 260 of the second arm 250 , and the shape of each top portion 220 , 260 is to prevent access to the trailer coupler 100 ( fig1 ) from either the top or the side , while allowing access to the hitch 102 ( fig1 ) of the trailer coupler 100 ( fig1 ). specifically , since the top portion 220 of the first arm 210 and the top portion 260 of the second arm 250 are brought together , except for at a top portion opening 280 that allows access to the hitch 102 ( fig1 ), access is not provided to the coupler bolt 110 ( fig1 ). as previously mentioned , the coupler bolt 110 provides a connection from the trailer coupler 100 ( fig1 ) to the tongue 150 ( fig1 ) of the trailer . by preventing access to the coupler bolt 110 ( fig1 ), the trailer coupler 100 ( fig1 ) cannot be removed from the tongue 150 ( fig1 ) of the trailer . beginning from the distal portion 212 of the first arm 210 , the top portion 220 , which extends in a plane perpendicular to a plane of the side portion 222 , contains a first step 290 having a top surface 292 and a side surface 294 , where a plane of the side surface 294 extends perpendicular to a plane of the top surface 292 . an end of the side surface 294 that is opposite the top surface 292 meets a central surface 296 , which is located between the first step 290 and a second step 300 . the second step 300 contains a first side surface 302 and a top surface 304 , where a plane of the top surface 304 extends perpendicular to a plane of the first side surface 302 , and where the plane of the top surface 304 of the second step 300 is parallel to the plane of the top surface 292 of the first step 290 . an end of the top surface 304 of the second step 300 that is opposite the first side surface 302 meets a second side surface 306 , where a plane of the second side surface 306 is perpendicular to the plane of the top surface 304 of the second step 300 . it should be noted that the first step 290 side surface 294 , the central surface 296 , and the second step 300 first side surface 302 may be referred to together as a first arm 210 opening . similar to the first arm 210 , beginning from the distal portion 252 of the second arm 250 , the top portion 260 , which extends in a plane perpendicular to a plane of the side portion 262 , contains a first step 320 having a top surface 322 and a side surface 324 , where a plane of the side surface 324 extends perpendicular to a plane of the top surface 322 . an end of the side surface 324 that is opposite the top surface 322 meets a central surface 326 , which is located between the first step 320 and a second step 330 . the second step 330 contains a first side surface 332 and a top surface 334 , where a plane of the top surface 334 extends perpendicular to a plane of the first side surface 332 , and where the plane of the top surface 334 of the second step 330 is parallel to the plane of the top surface 322 of the first step 320 . an end of the top surface 334 of the second step 330 that is opposite the first side surface 332 meets a second side surface 336 , where a plane of the second side surface 336 is perpendicular to the plane of the top surface 334 of the second step 330 . it should be noted that the first step 320 side surface 324 , the central surface 326 , and the second step 330 first side surface 332 may be referred to together as a second arm 250 opening . when the system 200 is in the closed position , the top surface 292 of the first step 290 located on the first arm 210 is aligned parallel to the top surface 322 of the first step 320 located on the second arm 250 . in addition , the top surface 304 of the second step 300 located on the first arm 210 is aligned parallel to the top surface 334 of the second step 330 located on the second arm 250 . the result of these alignments is top access to the trailer coupler 100 once positioned within the system 100 being limited to access through the top portion opening 280 , and even then , limited to access for the hitch 102 ( fig1 ). the first arm 210 and the second arm 250 of the system 200 are preferably removably secured together to prevent removal of the system 200 from the trailer coupler 100 ( fig1 ). to maintain location of the first arm 210 adjacent the second arm 250 when the system 200 is in the closed state , a tab located on the top portion 220 of the first arm 210 is removably secured to a tab located on the top portion 260 of the second arm 250 . specifically , a first tab 400 extends from the top portion 220 of the first arm 210 in an axis perpendicular to a plane of the top portion 220 of the first arm 210 . in addition , a second tab 402 extends from the top portion 260 of the second arm 250 in an axis perpendicular to a plane of the top portion 260 of the second arm 250 . each of the tabs 400 , 402 contains a hole for allowing a lock to be secured thereto . by securing and locking the lock to the holes of the tabs 400 , 402 , the first arm 210 is prevented from being separated from the second arm 250 , thereby maintaining the system 200 to the trailer coupler 100 ( fig1 ). the system 200 may be fabricated from one or more material such as , but not limited to , metal , or plastic . it should be noted , however , that it is preferable that the system 200 be fabricated from a material that is strong enough to prevent effective tampering with the system 200 that would otherwise remove the system 200 from a trailer coupler . as mentioned above , in accordance with alternative embodiments of the invention , the system 200 may be shaped differently . as an example , the bottom portion 224 of the first arm 210 and the bottom portion 264 of the second arm 250 may be shaped differently , as long as access to the ball socket 104 ( fig1 ) of a trailer coupler 100 ( fig1 ) is prevented so that a hitch ball cannot be placed within the ball socket 104 ( fig1 ). as another example , the top portion 220 of the first arm 210 and the top portion 260 of the second arm 250 may be shaped differently , as long as the hitch 102 ( fig1 ) of the trailer coupler 100 is accessible and the coupler bolt 110 ( fig1 ) is not accessible . further , the side portions 222 , 262 of the system may have a different size . it should be emphasized that the above - described embodiments of the present invention are merely possible examples of implementations , merely set forth for a clear understanding of the principles of the invention . many variations and modifications may be made to the above - described embodiments of the invention without departing substantially from the spirit and principles of the invention . all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and protected by the following claims .