The Decon bait/poison is very mild. I had a pest control guy tell me not to bother with it, but to buy "One Bite" bait and especially "Ramik" bait. This is the stuff that makes the critters thirsty so they will leave to find water (most of the time) before dying.
I use Moth balls... OUTSIDE the camper, wherever anything touches the ground - around the wheels and the tongue jack. I use dryer sheets and Irish Spring soap inside -- not sure if it bothers the mice, but the dryer sheets help to absorb moisture and the soap makes the camper smell good in the spring.
Personally I don't like the glue traps. You end up having half alive animals that you have to dispose of. Glue traps work and do the job, just be aware of what you may have to deal with. Traditional snap traps are quick and effective.