Correction: You have to tell them you're hauling a Prius with an F550. Gotta make sure you have enough tow vehicle.
The uhaul computer wouldn't let them rent it to you then, because the f550 would likely break down and require a $1000 fuel injector once you hooked something to the trailer ball. But yes, they do require enough truck to tow their trailers, up until recently I have never had anyone come out and check...
picked up a cab last weekend near Kingston ny. Took me almost an hour to get the trailer and have the uhaul lady ok me to leave. She came out and checked any and everything required and then some. Hitch and receiver ratings, tire load capacity and condition and air pressure, all my lights.she even laid under the truck and checked my brake lines and wiring(luckily I have some shiny new cuni brake lines under there).looked up my vin # to make sure the gvrw was correct.i was unamused by her over thoroughness to say the least.but she was overly nice, and just doing her job I suppose, so I just went along with it.
You must be registered for see images attach