I just had new 7.50 - 20 tires mounted on my original '54 4100 split rims. Had to go to four truck tire dealers before I found one that would touch them, and he said he didn't want to see them again. Anyway, I'm looking to go the 19.5 route, and have heard that the wheels from later-model Chev/GMC motorhome chassis have the 10 bolt pattern w/small hub hole that will fit. Anyone know about this for sure?