We made that trip, both directions, several times and at least twice with our Cyclone and then once with a 24' car hauler. We lived in New Braunfels and now live in Helena, MT. Our route took us up to Abilene, Lubbock, Amarillo on I27, and then hooked up with I25 in Raton, NM. We stayed on I25 up through Wyoming and into Montana where it hooked up with I90. I guess your route may depend on your departure point and end point in Montana. The worst part was out of New Braunfels on the very narrow back roads that were laden with deer.