I tow an Arctic Fox fifth wheel that weighs around 14,000 loaded and hardly know it's back there. Also, many times each summer, tow an 18 ft boat behind the fifth wheel. Absolutely no problems, tows like a dream. So easy, the wife will even drive (as log as we're not going through any towns!). I'm sure we're pushing limit and capacity of the vehicle but these trucks are designed to work like this, and the newer ones are even better! Bottom line, love the arctic fox and my truck tows the train like a dream, easy!!
2008 GMC Sierra LMM CCSB LTZ