It isn't. I have a corporate blanket policy that covers rentals and the vehicle I used to tow (corporate truck). It explicitly excludes liability when in violation of a contract such as the one you sign when renting a U-Haul. Sometimes it's a good idea to play by the rules. Accidents aren't something you can always avoid. Getting hung with a U-Haul trailer and a totalled car (or cars) wouldn't be fun.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

My insurance covers what I’m towing. I have 3 trailers but sometimes I need a car hauler. Uhaul insurance covers their trailer which is about $5k.

If your truck can tow 6000lbs they won’t let you take a car that weighs more that 2k. Their trailer weighs 2k so you could have 4K in car wieght.Just saying. If you want to be honest then take a different route. Maybe rent their large box truck to tow a car hauler ..

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

What they don't know won't hurt them!! I'll roll the dice on all of that. I just wanted to make sure the car fits on the trailer. Whether legal or right.... doesn't matter to me. Sorry. I'm just a blatantly honest person (about what I'm dishonest about).

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Current fleet-
2015 BMW 750i xDrive
2009 BMW 535i xDrive
2004 Chevy Avalanche 4x4
1993 Mercedes 300SD
1993 Mercedes 300SE (parts car)

Previous Benz's-
2001 Mercedes SL500
1983 Mercedes 300SD
1980 Mercedes 300TD
1996 Mercedes E300D
1999 E300DT
1984 300TD-T
1988 Mercedes 560SEL (parts car)
1979 300SD
2003 E500
2004 S430 4Matic
2001 E55
2003 E430

Dolly won't work. Get their larger trailer (they have 2 sizes). Bring your own straps. The ones that they use that go over the wheels looks well sketchy

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With best regards

Al