Towing small trailer with Class C help.

I have a little 4x6 trailer that I use for my ATV that has 12" wheels/tires and have towed as much as 500 miles one way in a day with no problems just watch air pressure and keep the bearings greased and it will be fine. My little Clipper has 13" tires on it an I have had no problems with it, I don't see why one would need bigger wheels/tires unless it is a weight thing or for more clearance.