Well, I shouldn't have just ignored when I first saw them around the ground outside the MH. Seen them while doing outside maintenance and washing. Some were on the power cord from the outside box into...
Borax around anything that touches the ground (tires, jacks, etc). We also try to make sure the water hose and electric plug wire do not touch the ground at all so as to eliminate a path for them to get to the camper. Once a few years back I had a tree branch touch the roof, and OMG a gazillion ants all over and in the camper. Now one of my final checks is to ensure no tree branches touch the roof or any part of our camper.