You will have a mighty battle on your hands. Last year (first year in our newly purchased tt) I opened it up to pack and was assaulted with carpenter ants. We almost went the wrong route and called in one of the pest control companies to spray. This is what you need to do: Try to locate where the ants are entering your trailer. I know it will be difficult but you can do it. The best way to find out is to enter your unit in the dark with a flashlight at night when the ants are most active. After locaing the entrance spot and making note of where ants are found in the unit (what corner, cracks and crevices have you found most of them near?) you can begin to treat. You will be using chemicals so must wear gloves when placing granules. Carpenter ants go between wanting savory and sweet so you may have to use the granules I'll tell you about and then use a gel to place in small traps after that. We placed the granules up inside the lip of the bunkhouse roof vent on a piece of cardboard and then closed the vent. We did that at the end of last season (before the ants went into hibernation) and refreshed the granules in the Spring. We saw no ants after that, but to be sure we were ant free, we used the gel in traps and we have continued to be happily ant free. I believe the site I bought the carpenter ant granules on, as well as the gel and bait traps to fill with the gel was something like DoYourOwnPestControl.com. If you go on that site and type in carpenter ant granules and carpenter ant gel, you should come up with the products as they are limited to what we used. Good luck. Those ants make life miserable and you'll be well rid of them. Make certain to remove all granules and bait raps filled with gel and clean the entire area before inhabiting it. Also, keep all chemicals away from yourselves as much as possible and away from children and pets as it can be deadly. Your careful handling of the granules and gel will make for a safer experience. Hope this helps.