Duramax Lifetime Supporter
Join Date: Oct 2009
Location: Jax, FL
My camper weighs more than double of what yours weighs.
Although I have never towed my camper through the Rockies, I have towed it through the mountains of TN, NC and WV.
Never, ever, ever, did I need to go WOT when going up a mountain. The truck will let you know the appropriate amount of throttle to give it. For me, going up the hills, I never put the truck over 2500 RPM. If the temps start to creep up a bit, just reduce the throttle. My truck seems to like that speed when towing the camper up the hills.
In doing this, you will be in the slow lane as others pass you. Just do the slow lane knowing that you are doing the right thing for your truck while safely towing.
The DM Ally combo is a wonderful thing, just don't abuse it and you will get many miles of safe/happy towing.
09 GMC SLT Dually
Steel Gray Metallic
All options except sunroof
Mods so far:
Alcoa 19.5s with Michelin XZE, Centramatics,Tow Mirrors, Chrome Grill Overlay, Rear underseat storage, Mudflaps all corners, 20% Window tint, 6" Oval Steps, B&W Turnover Hitch, B&W Companion Hitch, Sulastics, GM Campaign #PIT3009J, Wireless Console Charging, Bilstein 5100s, Raptor 3602RL
DF DRW Club Member #161