xcmountain80
Expedition Leader
There is a fabric available that is, essentially, something like Sunbrella that has had vinyl pressure impregnated into it. It is supple and water proof, but not very stretchable. My local boat canvas guy plans to use it to make the cover for the tent on my TrailBlazer.
Same thing I have my RTT covers made out of over the years. Not sure what it's called but it works.
A