My vac hose goes through the floor under the refer. If I remember correctly, TS laid 2x3's flat over the 1-1/2 in square tubing, so I would say there's about a 3 in. space inbetween floor decking and the basement ceiling. I think you could examine the plywood of each surface for nails and carefully drill a pilot hole to see that's inside that cavity, if anything.
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Slabman
2019 Newmar Ventana 3717
2007 Lexus LX470 Toad
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