I rebuilt a 73 250 revcon I blew a rear tire the electric Co used that 12 16.5 on their telephone pole dolley the two wheel dolley.that was a great handling coach. Never had a prob buying. Tires but that was in the late 80s. I did run into a big problem with that 250 the frame behind the rear axle was gone under the fiberglass pan mine was damaged and I removed it to glass it up i had to rebuild the frame and then undecoted the whole frame with non hardening undercoating I liked the vinal clad interior paneling way ahead of their time that to me was a better coach than the gmc a lot lighter.