About 10 years ago I made the move in a Penske. It broke down! It was a 26 foot truck. Luckily they repaired it overnight. It was near Salt Lake City it broke down. Fuel controller of some kind went bad.
Penske had to do FOUR alongside-the-interstate road-service call-outs for me, ~ 1,000 road-miles, Pensacola, FL to Sterling/Dulles, VA.
Near-as-dammit brand-new (13K miles?) 26-foot Cornbinder box truck. Faulty wiring, fuel system, OEM. Issue was already all over the 'net, any operator, that breed of International - once I got back and researched that.
Penske DID dispatch those third-party contract repair services rapidly, each time, every time, and even late at night or into the wee-hours of the morning. No cost to me. Damned small delay.
Plenty of same-same "one way" 24-foot // 26-foot Penske box trucks rented since. Only if "local" do i even LOOK at other providers.
Fewer mental "changes" to get used to quirks. And.... the 26-footer has driver-adjustable air-suspension.
Nary a problem since.
"Works for me", Penske does.
OTOH, If it ain't Diesel, or dasn't have BIG MIRRORS, big TIRES, and air-brakes?
Not on my dance-card - regardless.
That rules out most of U-haul's fleet, of course.