Anybody here tow using a Tundra 5.7 w/SR5 and Towing pkg.?

I have a 2012 Tundra w/tow and 5.7 engine. I have been towing a 27 tt w published dry weight of 6250. I would guess loaded I am around 8,500 lbs. and will weigh it someday. I just traveled to Branson, MO with some very steep grades and had no problems pulling them or any other highways I have encountered. I run 65 mph and pulling steep hills I might drop down to 50/55. The truck does fine and that 5.7 pulls fine. It's not a 3/4 but a powerfull 1/2 heavy duty.