Iodoform gauze is a type of sterile, absorbent fabric used to pack wounds and facilitate blood clotting and general healing. In most cases it is materially identical to standard medical gauze except that it has been treated with or soaked in iodoform, an antiseptic.
GCWR takes into account GVWR and loaded trailer weight. The GCWR is the maximum weight the vehicle can carry and pull together. The loaded trailer weight plus the GVWR of the vehicle cannot exceed the GCWR as specified by the manufacturer.
The GVWR is the weight rating the axles underneath the trailer are capable of towing. The GVW (Gross Vehicle Weight) simply means how much weight you are towing including the weight of the trailer, horses and gear. All weights below are approximate and can vary from your actual trailer significantly.