Road Trip from TX-CO-UT-CA

Sounds like you are looking at US 160 to 491 to 191 then I-70 to I-15. IF so then Wolf Creek Pass is the only big pass, with La Veta Pass much lower but still a pull. The rest of that route does not involve any big elevation change, although a lot of rolling hills, until you begin to drop into the LA Basin.

Wolf Creek and La Veta are good wide shoulder roads with passing lanes and should not be any problem. Just long pulls up and long down grades with curves on WC.

Watch the weather and plan accordingly.