What is your plan where I-70 ends? US-50 to I-80?
I would be more concerned about winter driving conditions in the Sierra Nevada than in the Rockies. My choice of route would be I-40, which crosses the Rockies at a generally lower level, but you can still expect winter driving conditions across New Mexico and northern Arizona, and from time to time across Oklahoma and Texas, although more often the first winter storms in Oklahoma are in December.
I-40 takes you into California through the desert, and whichever route you choose to get into the Central Valley, snow clogged passes are less likely than in the mountains west of Reno. Then you go up I-5 to your destination.
You'll find RV parks open along I-40 at least through Texas, but don't know about crossing New Mexico where elevations will most likely keep you in sub-freezing weather. By November, my travels are even further south, I-20/I-10 corridor.
Tom Test
Itasca Spirit 29B