Well I have very good news in that both the Slash and my Rear body mount held up despite some hard abuse in the worst way for a body: repeated rollovers and roof smacks. The thing also flies up my test hills like a bullet until something stops it, and is capable of going super far, despite the LCG chassis.
If you've seen my Yeti XL / Slash 4x4 video, then you'll see the exact same climbs I was trying out. There is a 2nd smaller hill that I think the ticket to making will be 3S simply for the speed to jump the lip near the end, but the big hill here is a different story. I got to the same spot pictured with the YXL and was also stumped several times with some harsh rollovers.
The rig (and my body mount in this case) also survived a couple dozen rollovers over the course of 3 battery packs. I geared up to 15/54 to give myself a chance on the climbs on 2S. The crashes are pretty violent, which I hope to get some video of soon, so for now just imagine the thing rolling over starting at that arrow on the 50° incline. I've tried to count the cartwheels but there's too many and it simply does them so fast that it's a blur lol. For reference, I was hitting the rocks so hard at the bottom of one climb (not pictured) that it was putting small dents in the aluminum panels themselves. I also think the panels help brace the cage in the case of flat roof landings/smacks while rolling.
Either way, I'm very impressed with the performance so far. I will probably get another differential or two and fill one with "diff-lock" putty and the other with 1-2 mill oil, and then experiment. I may also try the HCG chassis out as well, but will probably pick up sway bars to go with that. Either way, expect a video here sometime soon detailing the mount and some hill climb carnage...
Youtube: MegaSneetch - RC videos whenever I can make them!