We had those pesky things in our camper too over the winter. Hubby used Spectracide Bug Stop. Just don't let children or pets near the area sprayed until it has dried.
We found some old crunchy critters under the dinette seats when we first got our N2Upup. I sprayed Raid Max under the seats, around the ports of the a/c cord and gas line, along the corners of the floor (just like you would in your house), and in both cabinets. No bugs since! When packing her up for the winter, I also spray around the tires and jack where she sits in the garage to discourage entry.
I want to point out that the 'Bug Stop' we use, is not an aerosol can spray. It is applied by a pump spray bottle, in the corners, on the floor. Just wanted to clarify this.