Living here in warm, damp, humid Florida, ants are always a problem (MUST BE SNOW BIRD ANTS THAT DIDN'T GO HOME)
. Serious tho, when I park my TT the ground is sandy, full of leaves. I place fire ant granules by ORTHO all around the tires, stability jacks and raise the tongue jack up off the ground. If you already have infestation, get some bug bombs (three to a pack at LOWES) set off one to start. Cover your mattress or remove them completely. Remove all pots and pan, dishes (this is a weekend job)
Open all cabinets, storage areas, closets drawers. Cover your sofa with a washable sheet, cover your carpet in the area near the place where you set the bug bomb (news papers will do). Leave RV closed up at least 12 hours. Spray all floors near the walls with "Spectracide Bug Stop". Crawl under your RV, caulk all openings as much as possible (Water drains, propane lines)
If the one bug bomb does not get the job done, (known in the "hit-man world" as reloading) set off another one, wait 12 more hours before opening up. The ants are after something that is in your RV, dead rats, food, dead bird (was nesting). This is the solution that I had to contend with. I finally discovered they were traveling up the tongue jack to gain access. If your RV is a large one you may have to set off two at a time.
You have to get the "QUEEN" to stop them. Took me almost six months to rid my TT of carpenter ants, they had gotten into the fiberglass insulation, set up housekeeping and down right was partying 24/7
Good luck--"THE CARPENTER ANT SLAYER"