Welcome to the club and sorry to hear about your ant problems.
Weive had similar problems a couple of times.
We’ve used the Raid Ant Traps with success, both in our Sunline and in our house.
Also take some ant spray and spray it all along the baseboards inside the trailer and then ouside around all items touching the ground, such as tires, shore power cord, stabilizer jacks, etc. just to make sure they're not getting in where you have it setting.
Check the exterior to see if you find any signs of ants getting in. Sometimes they’ll get in by crawling up the shore power cord or stabilizer jacks, etc.
The other option is to bomb the coach. Close all roof vents & windows of the trailer tight, remove all food, dishes, utensils, cloths, etc., open up all cabinets, and set off a fogger/bomb. That should take care of anything that crawls.
Help this helps some.