Can a uhaul truck tow a 31ft travel trailer for 20-35 miles?

As long as the engine and the hitch can handle it, go for it. Just be very careful hooking it up, and don't skip any steps. My family found that out the hard way when I was a kid. Lol

 

I'm sure U-Haul employees could tell you horror stories of what people tried to pull with their trucks. Travel trailers generally don't weigh a lot, unlike, say a load of steel, you should be fine. Those things have the power of a moped, so it will be slow going, and probably for the best.

 

I think I can answer this as one of my businesses is a u-haul dealership.
Although u-haul has trucks capable of pulling that size camper (15ft, 17ft, 20ft, and 26ft trucks) the problem I think your going to run in to is the ball size.
Most all U-haul trucks have a fixed 2” ball that is welded in to the bumper and not changeable.
Most campers of the size you are talking about use a
2 5/16” ball.
U-haul has the welded 2” ball because most every size u-hall trailer uses a 2” ball hitch.

 

It you have an equalizer hitch, no problem.
Other wise , keep the speed down. For that short of a distance. No more than 55, maybe even 45. A speed wobble you do not want to experience.

 

You'd probably be better off calling a friend, and using their truck.

 

Another thing is be very careful if it's a box truck when you turn. Camper fronts are not that strong

 

And that big ### trailer is going to seriously wag the dog. Please whatever you do do not put the little 10 foot puppy on there.

 

Listen to what Hulld said before you waste your time.