You could use Cykick, but it only kills the exposed worker ants. As long as the nest is not contained within the walls of the motorhome, it should give fairly good results. Simply inject it into cracks, crevices and areas where you find ants. It can also be sprayed around the perimeter, tires, etc. If ants are numerous and motor home has been sitting for a while, consider using a bait such as the Maxforce Carpenter Ant Bait Gel
, Advance Carpenter Ant Bait Granules
or even the KM Ant Pro Ant Bait System
(outdoors only around the base of the motor home).