We have the Apex 279RLSS. Not a bunkhouse. Dry weight of 5400 lbs, est 6400 lbs loaded. It's only two of us and 3 small dogs. If your YXL has the HD tow package it will tow. I tow with a Yukon Denali 6.2l and HD tow package rated to tow 7900 lbs. Of primary concern is your payload...check yellow sticker on you door frame. My payload is about 1370 lbs. I pull the 3rd row seating and travel light. I Tow in the NC mountains with no problem. The longer wheelbase on the YXL is a plus.
We love the Apex and had two minor warranty issues which dealer fixed quickly. Quality is good. Our third TT in 12 years. You don't get automotive quality in rv's. They are mostly hand built...very little automation to ensure process repeatability controlling quality. Guy has a bad day...its shows up in the product!