U-Haul car trailer experience?

I have towed the u-haul trailers cross country at least a dozen times.
Trailers are built well. On one cross country trip a trailer had an issue and headquarters found the nearest u-haul store and switched the trailer out with me so I didn't have to wait for a fix. Only one flat over the years. Taken care of by the local dealership which did take a little while but they fixed it.
Get the INSURANCE !! These can be stolen easily and if damaged can be expensive to fix.
Car dollies are really not for more than a few hundred miles. I have had a tire go out on a car being towed with a dolly and it did damage it a little bit. Flat tire happened with a tornado visible within a mile of where we were.

Reputable company.