I am a new member to airstreamforums.com. My wife and I just purchased a 1978 31' International LY. My question relates to tires. The trailer presently has some L78R15 series tires on it that are in need of replacement. I have been waffling over ST225/15, ST235/15 and 7.00X15 tires. I would like to maximize the trailer clearance. It appears that the 7.00X15 tires are the best choice for me. I think that the ST235/15 tires may fill in the wheel wells too much as they are about the same size as the tires that are presently on the rig. Is this true? I was also reading a thread about someone purchasing a set of Toyo M-53 Hyparadial ST tires. Does anyone know if these tires are tubed or tubeless? Also does anyone know where they may be available? Are there any other 7.00X15 load range D tires made by any other manufacturers? Any additional suggestions?