It is a big RV – 28′ I think.
– I think most North Americans would consider this compact… 🙂
However, it’s still potentially going to be your limiting factor as the insurance may well be invalid “off road” and, from memory, all three rides I mention above require fairly rough forest service roads (particularly Martha Creek which is more DH, though still wheels on the ground, riding)
For Revelstoke, you may want to consider using this shuttle company to get to the goods.
Fernie is a great area to ride – I can’t remember which trails I rode but I’ve got a guide book at home and there’s a couple of good bike shops in town. The ski hill has a mountain bike park but it will probably be closed as of this weekend
I’ve ridden Rossland a couple of times but mostly with locals in pickups so my knowledge is a bit rusty, though, just as a FYI, 7 Summits is usually done as a shuttle (though it’s all tarmac so your RV is not going to have problems).
Kananaskis (between Calgary & Banff) is supposed to have some epic xc riding though I’ve never ridden there – get googling