[SteveC7010]

If you can safely place poison baits somewhere around but outside of the trailer, it will help reduce the population in the general area. Be sure to also provide a water source for them to drink a short distance from the trailer. The poison in D-Con and similar products is an anticoagulant and creates a powerful thirst. http://en.wikipedia.org/wiki/Brodifacoum

The baits should be located where children, birds, and other species besides rodents can not get to them. Same for the water and the carcasses.

We set D-Con in the trailer each fall when winterizing with no water source. The mice and rats will exit the trailer seeking water to drink.

It's an option that some folks may not want to do, but it can be very effective in controlling or eliminating rodent populations in the vicinity of your trailer storage site. We used D-Con to pretty much eliminate mice any where near our home in the country.