Wow! I didn't realize you were coming from Oregon. Sounds like a fantastic trip. I talk to full timers all the time at many of the places we camp. I would love to do that, but my DW wants a "home base" and I don't know I could afford to do both.
Just curious since you are leaving in winter, which route are you taking? It looks farther, but the southern route down to LA and across 10/20 looks the warmest.
Google routed down to SLC and across 80. Then down through KC/StL and the rest of the trip I make from outside St Louis. I've made the trip from StL to SLC a number of times... in September. One of those trips, they had a storm come through 2 weeks after I was and I-80 was closed through most of Wyoming. I can't imagine what that part of he interstate looks like this time of year.
j