Hi, JonJon
Just wanted to let you know, I run 27 x 10 x 12 Super Swamper Vampire's on my 05 Rubi.
I run in D1 mostly but if I'm leading our group and come across a good mud hole I usually bail in using low range just to be sure I can keep the RPM's up. If I'm trailing, I watch the guys in front of me and usually go in using D2 or D1. When I first put the Swampers on I had to learn to use the low range and D2 mode. I also learned to use the ESP mode too. I think deep water would be the worst enemy of the rubicon due to the electronics on the machine. If it's power you worried about ....DON'T
Happy riding.......