when you feel what will feel like a shuttering through your seat, let up on the throttle some so it quits. once you get going, it will be harder for it to happen.
I had the same lift on my 06. I never had traction bars and it was fine. Doesn't hurt to add some tho. I had a 16" drop and an 18" drop hitch that I towed my TT with. Around 12k lbs, but nothing majorly heavy.