
I own a 2008 quad cab, 4X4, SRW, 6.7, 6 speed automatic with 4.10 gears. I plan to replace my 35' 5TH wheel toy hauler with a bigger one with 3 slide outs that weighs about 16,500 pounds loaded and ready to go. Should I refrain form using 6TH gear? The truck has about 12,500 miles on it and about 11,500 miles hauling my current toy hauler. It tows this camper just fine in 6TH at 65 mph. Should I not be using 6TH? Thanks Rick