I spent several evenings searching via Google trying to find something that might replace the track and didn't have any luck. I take it your's is pretty torn up.
I've been wondering if it wouldn't be possible to make a section out of some UHMW on a milling machine. If you have a strip out can you sketch up an accurate cross sectional view? I can mill a slot on my milling machine that is about 30" long in one pass.
Air forums # 1674
1974 20' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels, brake drums, windows & holding tanks left to sell)