Release of Liability
In California when you sell a vehicle you can file a Release of Liability form online or you can print one from DMV's website. Check your state's Department of Motor Vehicle website, they usually have a section "When you sell a vehicle," and lists what paperwork is required.
I would request a cashier's check, hand write or type a bill of sale and keep a copy of all registration, ownership documents etc.
Also, I had very good luck selling our 1998 Itasca on RVTrader.com and we sold our former "toad" on the Thor Forum. It seems online is the way everything is done these days.
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