Great trip! You are going to see some amazing scenery. I think you will be ok with what you have. Just take your time and don't try to get too much out of your truck. You might want to avoid Hwy550 between Durango and Montrose. That is a series of REALLY tough climbs and switchbacks for many miles. There is a bypass highway that is much easier and doesn't add much mileage. A copy of Mountain Directory West could be valuable too. You're not going to set any speed records, but it is vacation, right? Hwy 550 is the only road I know of that would be hours at a time. Watch those downhills, and do you have an auxillary tranny cooler? If not, GET ONE. P.S. The train ride from Durango to Silverton is very much worth the price of admission. Beware riding in the open car, you will return with ash all over you. Have a great trip!