I just learned this recently that jumping in 4wd is rather tough because one set of tires hits first, then the second set and it will shock the drivetrain and transfer case or tail of the transmission will take the blow. Will I stop jumping?......Nope. And I've been too busy with other parts falling off on landing.
Could you get some pictures of the front bumper, and how it's mounted behind the stock bumper? Thanks, i'm trying to do something similar with my stock bumper.