i wish i could find some skinnyer rims!, right now im sittin on 32x7 16" tube type bias plys, and the skinnyest rims I could find were 6.5" wide, the only other rims i could think of to look for were stock willys jeep rims, but where does one find a set of those  
I havent tryed airing down my tires yet, havent had a chance, but im expecting bead probs

Have a hunt for some old Suzuki LJ rims. They had a skinny 16". I'm now running some skinny 7.50x16" (32") on some Sport 6.5" rims and they great but then again I have some internal pneumatic beadlocks so I can run 0 psi and won't pop a bead  The Problem I've had in the past wasn't so much popping a bead but rolling it enough to get mud etc. in there and I regularly ended up with a slow leak.

The LJ rims were 16x4.5's, but they're very hard to find.  Old Jeep rims are the same size, and much easier to find.  The only real difference is the LJ rims have an extra hole for adjusting the brakes.