You are not alone. This was my fix, and like you, I still cannot keep anything tight on that same place near your tires. Before the rest of the metal and Chloroplast break out, add extra large washers under EVERY screw. I've done this to everything under the camper. Also, that yellow stuff is is liquid nails. I never wanted that stuff to fall again while on the road!
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Who you are right now is a sum total off all you use to be.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually