1. Go to a camper show and see if anyone makes what you want new. Then go looking for that unit used.
2. Spend as much time as it takes to find that "lightly used" unit that was stored indoors.
3. You apparently live in CA, so I assume these will be relatively shorter trips. So you won't need to load up a lot of extra cloths and food. Try to travel light.
4. Your two children are still very young. I would be reluctant to go the tent route. I always said it was a bigger adjustment for us going from one child to two children than going from no kids to one child. Anyway, two young children require constant attention and supervision. Just getting a family sized tent setup while keeping an eye on the kids could be a real chore.
5. Consider item 4, and then add in rain.
