Towing to Rocky Mountain National Park

I pull a slightly smaller trailer with a 03 Expy/ less HP/ fewer gears and a 07 like yours. The 07 is faster up the steepest stuff and more gears means better speed control coming down. That said I still use the 03 more often, it has the better ride. Most of the time hair pin curves keep you from going too fast no matter what you are in. Being in control going down hill is much more important than fast up it.