Bug issues

The Trailmanor, mine is a 2000 2720SL, has large gaps where bugs can get in. Especially at night with the interior lights on. Does anyone else have this problem? I have mitigated this by re-wiring my vent fan so that it blows in. It keeps the bugs out, especially when all the windows are closed. Seems like a PITA thing to do. So, just wondering about other's experiences.