Any idea for mounting an 11 Lb. LP tank on my popup?

I thought about that but my bed won't slide out with the tank in place, it is just a little too tall. I would have to put the tank on the ground before I setup. That wasn't a big deal to me however I like the ability to exchange the 20 Lb. tank if needed. Not as many places will refill tanks, but you can get a 20 Lb. tank exchanged just about anywhere, not so with a 30 Lb.