Originally Posted by udonnelly
It's probably in a thread somewhere, but I need to replace all 4 tires on my 1975 Airstream. The specs say:
6 ply tires
Steel Radial tires
I've been looking all over and have only really found 8 ply.
I recall looking for new tires a few years ago. You want 6 or 8 ply C or D load range tires. Cross ply tires are supposed to be a bit stiffer and I have been told (don't know if it is true- but..) cross ply tires are better for most trailers, definitely use an ST type, though I have been told on the lighter trailers (like tradewinds) that LT can also be used.
ST= special Trailer ---very stiff side walls
LT = Light Truck---stiff side walls
If you use a D load tire - only inflate it to C range (50-60) pressure. The tire can take more but your rims are not made for higher loads...this is all second hand though, I am not a tire guy. Search the tire threads, I also got a lot of information from the forum.