You can rent the RV one way, we used Cruise America and we then stayed at KOA campgrounds. It only took five days I think but we were pretty anxious to get here. I sold my car as I had a black leather interior which wouldn't work well here in Phoenix and we had my wife's car shipped.
I bagged up the adults and used deli style cups for the babies. I then boxed them up in the largest shipping boxes Superior Enterprises sells. I would check them each night once we stopped. I used heat packs in the incubator and was able to plug it in once we stopped. It was August so I didn't have to worry about heat as I was more concerned with over heating.
Actually, the two cats were more of a pain then the snakes.