Thanks, the middle seat has been a great mod for me. I plan on getting a lot of use out of it this year with some expo type trips.
So, quick update from the end of last year: I've been fighting some vib issues which I tried to resolve with dynamic balancing beads. That seemed to work somewhat, but while in Moab the situation seemed to be worse and any speed above 50 mph produced a violent shimmy from my front end. (I may have tweaked another rim when I lost my bead on that first trail...)
Well, with 3 bent wheels it seemed like it was time for a new set. However I wanted to take precautions against the same issue happening again. I considered bead-locks but didn't want to deal with the hassle of safety inspections with them. I looked at stronger rims but most are cost prohibitive. I tried for used aluminum but in my rim size (15") there were none to be found (my 37" MTRs have about 90% tread left so no sense getting new tires.)
So, as luck would have it, my in-law picked up a new-used set of tires which came with wheels in my bolt pattern (5 on 5.5). So I grabbed those for $100:
With regards to added strength, I opted for rock-rings on the outer lip. A local guy has a CNC plasma table and cut these up for me for great price:
I removed the weights and valve stems - I needed to relocate these:
I welded up the old stem holes:
I wasn't 100% confident that they all would be air-tight, I've had mixed results in the past... So I ended up hauling them to another

member's house for verification. he ended up re-welding 3 of the 5.
Then I welded up the rings - pretty straight forward, just drop them in and tack them in place, then weld about an inch at a time along each mating surface. I only took this pic though for some reason:
I also wanted to strengthen the inner-lip but a ring wouldn't work inside. Another local

guy works at a rebar fabrication company and he bent me up some 1/4" rings. Those worked great - I started by clamping them into place:
Then I tacked them around, moving the clamps as I went:
I read online that you should leave them long and overlapping until the end, then cut it down and complete it, which worked well for me:
Then it was connect-the-dots:
(It's not what it looks like - I pulled it back inside the garage to take the pic because the light was getting bad outside. I don't weld next to gas cans!)
Finally, I relocated the valve stem holes to line up with the cutouts on the rings:
