You won't have any issue with fuel along any of the interstates. Cell phones work well on the interstates also. Taking 24 from Limon to the Springs is the right road. You may want to spend a day or two there, lots to see. Pikes Peak etc. Is a KOA in Fountain just south of the springs. Take I -25 to Walsenburg and 160. Only pass will be Wolf Creek, no biggie. Then easy riding all the way to Mancos. Fair number of campgrounds all along 160.
2011 Toyota Tundra double cab