You'll never get a rock solid setup on an RV unless you block it up off the suspension. I have JT's and they work well for getting the wobble out, but you still have the bounce. The instructions kinda sorta say
level RV, then drop front back down about 3/4"
drop rear jacks down and tighten JT's
raise front lacks to level again and tighten JT's
bump front jacks up