I seriously would not use mothballs in an RV.
Moth balls are toxic to humans and 'especially' if you have children. Add them to the small confines of an RV and they are even more harmful to you and your family's health.
snip it:
mothballs contains 396 grams of naphthalene, which is sufficient to raise the average residential indoor air concentration to approximately 200 micrograms per cubic meter over a period of 1 year, though in small homes or apartments this would be expected to be much higher. Exposures of this magnitude are commensurate with industrial exposures to ... jet fuels.” (rv's are 1/4 that sq footage)
Babies are especially vulnerable because their bodies are less able to clear naphthalene byproducts formed in blood.
they’re a health hazard for kids for several reasons. Naphthalene exposure can cause red blood cells to break apart, a condition known as hemolytic anemia. Just the slight smell of a moth ball cuts my airways off and puts me in the hospital.
Mouse and bug control in an RV.
At night turn your inside RV lights on and crawl underneath your RV.
You will be shocked how much light will be shining thru all the holes left behind by the manufacturer. You need to fill all these holes with Great Stuff or whatever. That is what will stop the mice from coming in.
In a MH be sure to have ALL your heating/ac turned off so the vents are closed before you shut off the motor.
