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I grabbed the information from United Rental website.
https://www.unitedrentals.com/en/equipment/trucks-trailers/trailers/trailer-equipment-14-16-tandem-axle
You can definitely fit the HMMWV on a UHAUL. I just drove up over the fenders. They're pretty stout. The vehicle on my rental contract was a 1977 Jeep J-20. Otherwise you can try and get a 14-16' United Rental Tandem Axle Trailer. They can be up to 90" wide in between fenders.