Hey fellow priuii owners. I want to be able to carry a trike on the back of my v. I would be using a rack that goes in a hitch. What are the differences between a 2in and 1.25 etc. The trike weighs about 35-40lbs, is this too much for a rack? I see that people buy hitch racks to haul by weight, but I see this thing called tongue weight. Brian