I had a Tent Trailer and now a Travel Trailer and I used moth balls when I stored it. They will enter where ever it touches the ground, jacks, tires etc so spread them around the complete trailer along the ground. Never had any mice.
Plug up EVERY hole you can find. Small ones with stainless steel wool; larger ones by covering with a nailed down can lid; vents, etc. with tiny hardware cloth. Mice can get in through a hole as small as 1/2" so be vigilent and don't forget to check storage bays, ref,furnace & water heater vents, etc. Do not leave hoses, cords, etc., connected unless you MUST and then be sure all access possibilities at these connections are plugged up. Do not use mothballs - they do little to discourage the mice and a lot to offend you when you reopen the rig! And do not use the Decon type stuff, either - this causes them to crawl off and die and their favorite spot to do this is somewhere you cannot locate to remove their little stinky selves! Also, when you are camping, be sure to close all storage bay doors - we had a pair take up residence overnight and in that time they tore up a whole roll of paper towels for their nest! They were dispatched promptly but we close doors now!
*This Message was edited on 30-Jul-02 06:50 PM by Joy*
Mothballs are useless to deter mice and so are those little electronic 'sonic' gizmos. We tried both to keep the mice out of our garage when we had to store our furniture while our house was being built. The mice built nests in the numerous boxes of mothballs we set around and in the furniture, and used the boxes to store the sunflower seeds they stole from the birdfeeders. Don't waste your money. And like someone else said, mothballs stink besides.
1983 Itasca Sunflyer moho (Arvie) (big toy)
2005 Chevy Astro
2005 Palomino Mustang (Sally) (slightly smaller toy)
It's best not to store the rv near any woods or tall grass. They don't like to be out in the open. A hawk , fox , coyote , barn cat will catch them out in the open. Those glue traps work , but check them often.
We had a big old Pace Arrow that we were living in while we built our house, and had a real problem with mice out here in the country. The cat was alert, but could not catch them.
I solved it by using a couple of cans of that foam insulation stuff. I went under the motorhome and shot it into every crevice I could find. Then I went inside and looked for holes where the plumbing and electrical came in; filled those too. One thing, though, the straw that goes onto the can of foam will clog if you hesitate for more than a couple of mintues, so look first and then plan your route.
After we cleaned up the droppings off the counter the last time, we didn't find any more evidence of entry. Remember that the mice can compress their bodies into a size as big as a pencil, so fill every possible hole under there!