Wow! thanks for all of the responses. I was researching the truck a little more last night and it looks like its max tow weight is 8800lbs. my trailer weighs around 8k so I will be limited as to what all I can put in the TT. I wouldn't dare go through the state park between Cherokee and Gatlinburg pulling a 5'er lol, I will be sticking to main roads with the least amount of incline grades as possible. My truck does have 220k miles on it too so I guess I better take that into consideration. Thanks for the post that gave the info about the elevation website, I might can use that to see if I have anything closer around me that i could test the truck out on to see how it does. You all are great with all of the information you shared. Thanks again!!