Suggestions for RLS w/dry weight around 5,500#?

We have a Apex 279RLSS. Towing with a Yukon Denali rated at 7900 lbs. I removed the 2 rear seats (7 seater) and don't load heavy in the Yukon. TT dry is 5400 lbs. loaded, I est. at 6200 lbs. me, my wife and 3 small dogs. I pull frequently in the NC mountains. If wheelbase is a concern, I haven't seen evidence of any issues. WDH and sway bar installed. 6.2l pulls it nicely using tow haul mode and often with cruise on. My attitude is always..."steady as she goes"!