Yes, UHaul had the Toyotas with the dually one ton axles but everything has a limit. I think there is a good reason why Toyota decided to to stop supplying chassis's to motorhome manufacturers. Even with their full floating axles these chassis's are inadequate, not to mention the frame and brakes as well. Look at Shoprats post above. His unit weighs in at around 5800 lbs. He also mentions, and rightly so, that many people are driving these things overloaded.