During our PDI four years ago, I noticed the same size hole in our floor for the water fill. Even though there was spray foam between the top of the tank and floor, I had the dealer seal it up. They used a heavy black tape, and although it's ugly, it's in a cabinet, out of sight, and it sealed the hole nicely. I'm sure that black tape was intended for the underside, so it would be OK for your cuts.
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Think you're too old to cry or swear out loud...walk into your hitch in the dark.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
2 new fluffy Corgis, Bayley and Stanley
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