I dont rock crawl(too slow lol). But a lift on the Tremor and a set of 245/70s will help those angles get closer to a stock BadBS, which is decent.It'll go around a turn track as good as a BS Badlands(Which I've done and its pretty fun) but suspension doesn't magically make it a great rock crawler with that wheelbase and untouched rear bumper.
I did drive one of those and gave it the goose on some turns and it felt planted. Track time especially tuned could be real fun. The weight distribution could make the Tremor feel even better possibly.
As long as the Tremor makes the rough stuff smooth, gets me out of some slop and ruts, and scurry up hills I will be happy with it.
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