Well, it isn’t just you, but that doesn’t mean your RV isn’t the problem. Yes, in the fall, stink bugs are looking for a place to survive the winter, and RV’s are very vulnerable. why? Because slide out seals—especially when open—are not perfect barriers, and there are more holes and gaps in the coroplast that covers the underside of your trailer than you know. And there are numerous openings in the floor of your trailer that connect that underbelly/basement with your living area, such as every place electrical wires, water lines, and drain pipes drop through the floor. No, those holes are not sealed. One of the first things I’ve done with my trailers is get underneath—armed with a good flashlight—and seek out those holes and gaps. Even though the factory applies expanding foam on the most obvious openings, i.e., where your drain pipes drop through the coroplast, as well as the waterline drains, freshwater-tank drain, brake wiring, etc., there are more openings than you think. Look at where propane lines run, random ground wires poke through, where the coroplast is cut around axle suspension parts. On my Alliance trailer, the spare tire is suspended underneath on a cable and pulley hardware. When I dropped the tire, I found a large cut in the coroplast, where they reached through to pull the cable down. They also poked drip holes in the coroplast at regular intervals along the bottom of trailer. You will even find gaps along the edge of the coroplast where it attaches to the bottom of the frame. Worst of all, the front edge of the coroplast wasn’t even attached at the front of my trailer. They had taken the extra coroplast and bent it up and back, leaving a gap between the tongue rails. I know, this is a long explanation, but it IS the key to bugs getting into your trailer. I use a bread knife to remove most of the foam, so I can find hidden gaps. I use flashing tape to cover larger openings. I use urethane caulk to fill smaller holes, especially along the edges of the coroplast. And I use small squares of window screen, attached with the caulk, to cover each and every drip hole. Oh, and after taping that hole
at the spare tire, I used my caulk to glue at patch of brass wool around the necessary small hole the cable passes through. Bottom line, anything that can get into the underbelly of your trailer can and will get into your living space. Good luck
By the way, I have found that pouring alcohol on a paper towel makes a good tool for grabbing the little pests, without all the stink. I use 99% pure alcohol.
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