I used plumbing strap and self tapping screws. That was on a trailer without an insulated underbelly, but you could something like it with the insulated underbelly, if you know where the crossbeams are. Screw directly up into them.
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TV: 2021 Ford F-150 4WD XLT Crew w/ 3.5L EB & HDPP, payload: 2,416#.
RV: 2020 Rockwood Mini-Lite 2507S, Propride 3P hitch w/ 1400# spring bars
Camping nights: 2021, 52; 2022, 99; 2023, 88; 2024, TBD (Est: 80+)
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