Thank you everyone for the honest advice! You were supposed to say "hell yeah! go for it", then wait for the carnage. lol.
I'd love to see how Toyota did it in a pair of stock 4runners! Looks like they had some trail damage to the rear door on one of the two they took. I was running GX460 rear air suspension for a while - that was handy for situations like this because I could raise the rear height 6 inches on demand, but I've swapped it back out for ride quality reasons. The pics were with OEM shocks - with long travel shocks it would go another 3 inches higher than that. I could never sort out shock valving to match well and the ride was soft - but not comfortable. Maybe I should toss the bags back in for this trip if I end up doing it. I really don't want steel bumpers. Keeping weight down is a major goal of this vehicle as a daily driver. Might have to just accept a rear bumper or maybe a custom skid setup that I can remove after? That plus some new sliders that have a bit better protection for the rear doors would go a long way I think. I'd really like to go give it a try. In the FJ40 on 40's it's usually kinda just point and shoot- but mechanically it's been unreliable. It's going under the knife for a complete new drivetrain and tube frame. The 4runner makes the trails fun again. I did buy a white one because it's easiest to match the paint...
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FWIW the front 30 spline axles are amazingly strong. The birfields are much larger than mini truck stuff. Probably larger than 80 series solid axle birfields, but I haven't seen them side by side.