Those clamps look great! Would have done that if Iíd known about them years ago when I mounted my Rotopax. I did actually use the 2-crossmember technique you mentioned, and itís been working perfectly for a long time, and on rough trails. Just sandwiched them between two steel plates with the Rotopax mount bolted to the top plate. Hope you have a fabulous time in Moab and please let me know if the Lockhart Basin Trail is, in fact, so eroded that all vehicles will encounter damage (as one member recently stated). Iíd really like to make sure as I would like to see a run happen there this July (Moab B4 Summit - you coming?).
Yeah, 2 cross bars would be ideal, but my solution is just temporary until I have the funds for a rear bumper where the rotopax will end up living. I'm sure I'll find a use for the clamps for something else after that.
Moab / Lockhart was absolutely amazing. This was a pre-run for Cruise Moab with Wasatch Cruisers; it'll be the first time the event is running Lockhart and will be an overnighter. We lucked out with nice weather; hit or miss showers Fri, sunny and 60 on Sat, then only rained a little bit Sat night into Sun morning but cleared up before dawn. The scenery was phenomenal.
As for the main obstacle in the wash at the very beginning of Lockhart, yeah I wouldn't attempt to run it unless you're on 35s with at least 1 locker. It definitely doesn't look difficult at first glance, but the rocks are super loose with a big round boulder top and center to get hung up on. We had 8 in our group (3 100 series, 2 80 series, 1 GX470, 1 4Runner, 1 FJ), two of the 100 series broke front diffs on that obstacle, 4 out of the 8 had to winch up. The 4 that made it up with out assistance were all on 35s with lockers. Because of that, the official Cruise Moab run will do it in reverse, south to north. A lot easier to roll/slide down that obstacle than crawl up it!
I still plan on meeting up with everyone in Moab before summit. I'd love to run Lockhart, but I need to replace my Demello front bumper before I hit any other trails (the aluminum is cracking pretty bad around the frame mount points.) It's going to boil down to budget and timing if I can get a new front bumper for the FJ, or a rear bumper and sliders for the 80 in time. Either way, I should be able to run a couple of the more mellow trails.