I keep two things in my 5er at all times, Eliminator Ant, Flea and Tick Killer and Ortho Home defense. Before I pull the RV into a slot, I dust the ground and area around the parking slot with the eliminator and spry the RV with home defense after I pull in. So far have had no problem.
I know this is a little overboard, but I have been infested before, lady bugs in Indiana (these things bite!), flees and ticks in Texas and stink bugs in TN, and took forever to get rid of the pests. So far no other infestation.