Did you check these out?
Here is a site that caught my eye.
https://rvshare.com/usa/california/los-angeles/rv-rental/class-a
It has reviews and superficially prices look competitive. On par with the stripped down class C's I mentioned.
Just be very careful with the fine print. That price per day is the base, you will have fees so please make sure you account for those.
This looks nice, sleeps 8, has bunks etc. Diesel so will ride extremely well but still only 36 feet in length. Anyway, some food for thought. I estimated a trip and it comes in at close to $350/day which is a pretty good price for all it offers. It includes dishes a bike rack, TV's, DVD players, HDMI cables, etc. Again, just a cursory look, but this seems to check a lot of the boxes for you. It even states, "international travelers welcome", so they are likely used to helping you with your particular scenario.
https://rvshare.com/rvs/details/1005673
