This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to install a subaru outback trailer hitch 
Purchase the appropriate after-market trailer hitch kit for your model year subaru outback. 
Inspect the parts for damage and to ensure that they are all in the kit. 
Raise the rear of the outback and place it on car jacks.

Select from:
(I) Trim (remove the springs) the rear gear netting to completion. The full hitch kit consists of 4 wood bolt posts in the base position.
(II) You could do your work while the outback has all 4 wheels on the ground, but it is much easier to raise the rear end. Remove the 4 hangers , 2 per side, supporting the exhaust pipe.
(III) Your vehicle will be entirely removable under the rear hood if the forms are faulty. Screw the outtop hitch's traction bars down and backward.
(IV) Install the grill head on the bottom of the vehicle, so that its pressure is placed gently on the top of the engine posts. This will provide some heat during the installation of the gear head.
The answer is:
(II)