the wanderer series by thor has electric beds in the cargo area. might try a local thor dealer to see who makes teh set up for them, I am sure its the same for most of the rvs
i googled it and came up with egads of possibles
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Living in the Piney Woods of Texas.
My DW and I have an electric(heated) matteres in our 30f Cherokee It is a king size mattre but I would bet that they also have them in queen size and mabey full PS it is real comfey to