I would use countersink head bolts on the side bracket and countersink wood screws on the bottom edge with countersink washers under the heads of all. Go to Lowes or Home Depot website and search for "countersink washer". Had the same issue with my popup dinette and never had an issue afterwards.
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2017 Silverado 2500 HD, 6.6 Duramax
2018 Eagle HT 314 BHDS
Blue Ox WDH
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