Are your tires too wide? I had 33's on my old yukon and I put it on a Penske flat bed. I had to buy a tow strap and lengthen the tie down straps that go around the tires but it made it from D.C. to south Mississippi just fine.
Oh, and if you haven't already booked it I HIGHLY recommend Penske over uhaul. I have never had a truck more than 3 years old from them, and never any problems. One more tip, join AAA if you're not already a member, the amount I saved on the rental paid for 2 years of membership.
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