Had our TT aligned last May at a frame shop in Topeka, KS that specialized in large trucks and trailers. Cost was $ 349.00. Tires were wore out with severe cupping on the inner and outer treads with only 4000 miles. At first glance tires looked like they had been run under inflated, but I have been very religious about maintaining the correct tire pressure. Trailer came with Chinese bias tires with bad sidewall cracking after one year. Replaced the bias tires with radials and very happy with both the alignment and radial tires.