I've never tried silicone, nor sealing on top. I'm not in your hot climate, but it has gotten very hot in out TT on the strings of 95* to 98* days we had this summer. I do recall checking the tightening rings on them all a few years ago when it was warm inside, and they did take a 1/4 turn or so.
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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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