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Yes custom base with holes in the exact spots where the tie down points normally would be. Basically made a cardboard template, replace the tie downs with SS bolts, added another piece of timber the exact size of the fridge slide to the base plate (needed an extra 12mm to stop the slide catching on the tailgate with fridge on board) and covered the whole lot in carpet - looks almost factory and takes 2 minutes to remove

Then just screwed the ORS into the top board - all made from 12mm ply.
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