RE bug zapppers.
Since the manner in which they work is to "entice" the critters to come get crisped, move them 25 to 50 feet AWAY from your rig. You'll find a lot less bug invovlement that way. We learned this one while tent camping years ago. If we were in a close quartered campground we never put ours out because our neighbor's worked for our campsite as well. (doesn't work for ants though..darn it)
I like Yard Guard, but had never heard of thermacell...gotta check that one out.
JandC
If you have the extra interior socket, those plug in sonic pest controllers really work. As long as the sonic waves are not blocked by furniture, walls etc they put out a invivisble pattern that the buggies don't like. I have one in my stix'n'brix and only the flies seem immune to it...keeps the pesky spiders away, too.