I read the post about tires-we used to have a 24 ft toyhauler- 2004--We went on an outing and on the way back we had a flat tire- we changed it and went on and stopped at a tire company to get some new ones -- we did not notice anything until after a while- our tires were not holding up- we looked at them and they had put 4 ply tires on our toy hauler- needless to say I have not been back to that place--so always make sure your tires are the right ones for your unit: