A RWD sedan and a FWD minivan (of reasonable size) can pull most any aero load down paved roads. Well in excess of "ratings". For more miles than the owner will likely keep it.
However, when one gets down to the very smallest cars, the limitations become apparent quickly. One must be more careful about cooling system capacity, etc. Most states require trailer brakes at the 2,500-lb level. I'd stay well under this with a smaller car. The trailer itself probably has a manufacturer rating that -- with an inspection of tire rating -- ought to give an idea.
Trailer brakes are ALWAYS a good idea. And can be fitted to anything (there are DIY harness kits for the tow vehicles + brake controllers).
Be reasonable. Vehlcle life still trumps saving a few bucks in gas.
And check the U-Haul website for your car . . if they rent a trailer for it, you're likely good to go with what you buy.
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