My first time to Florida I though it was going to be my last time there!
Never had a bug in my life in my RV until I headed south.:R
You can start by buying a product called Sevin Powder. Sprinkle around ALL the tires and around ALL the hoses, water, electric anything that touches the ground and that touches your RV. Don't lean anything up against the RV AND don't put storage tubs outside your RV. There are holes under the handles and the critters crawl inside your storage tubs and then you bring them right into your RV when you leave.
I finally switched to Ortho Home Defense Max. Comes in a real neat container with a battery operated spray wand I now spray this around the ENTIRE MH after I park it. This has completely stopped any bug evasion.