At one time we had a 35ft. TT that we used at the Summer Seasonal CG while giving the 5er a rest....When we would close her up, we did the steel wool thing in any cracks or holes the little critters could get into....also used dryer sheets in drawers, closets, and on the bed and couch....but have done the mothballs thing, too...Mothballs tend to stink things up..
, but a day or 2 of airing things out will do the trick when you open up next year.....