Our rig was about 2 weeks behind the expected delivery date (I think 4 weeks total)... and it arrived with a flat tire. We have no idea how many miles were put on the rig with the flat, as it would barely hold pressure for 12 hours at a time (completely flat every morning). They had to give us a whole new wheel - that one was cracked. Made us a bit leery about the delivery driver's experiences... but since then, we haven't had any issues [knock on wood]. We did put new tires on last year, before our 4th year traveling. We didn't have that many miles on the tires, but didn't want to push our luck with the towmax.