This may sound silly, but it does work. Get some citronella camping candles (2 or 3 of them), open them up and simply put them inside your camper. Do not light them, just let them sit. If you get the camping type that comes in the miniature buckets, those are perfect. Simply open them up and leave one at the front of the camper, one in the middle, and one near the end, and close up shop. The citronella will keep ANY bug from EVER wanting to enter your camper. It works, we use to do this all the time. Also, it works when you're actually camping too. Keeps mosquitoes out. They don't even hang around the outside of your camper. Do not light the candle, just let it sit open.
