We had mice for a few days prior to opening last year (we know they were not there long as they had not chewed anything and the pile of pumpkin seeds was stacked, not chewed...thank goodness!).
Where there is one mouse, there are 20! I have been looking all over online, and I found one additional solution I will try this year to be EXTRA sure (in addition to traps set in garage/mice caught, holes sealed up, more traps out and changed regularly, food nearby for mice to gravitate to). It sounds wierd, but my engineering dad is all for it! A guy on the RV Newsletter site posted pics (if I can find a link, I'll post it but I am not savvy) of what looks like rings of sheet metal around each contact point (ie tires, hitch). The premise is that if there is nothing for the mice to grab onto (tires, hitch, even a plug wire) and just slippery metal in it's place, they can't get in. Why not? The sheet metal sits on the floor in a perfect ring around the tire, like a doughnut. I forget how high the sheet metal goes, but it obviously does not touch the bottom of the trailer and will be high enough that a mouse can't stand up to grab the top and hoist him/herself onto it. I'll let you know how my contingency plan goes!
Meantime...set the traps along the path, remove food source, plug holes in TM with steel wool. Clean the prior nesting spots thoroughly (Pine Sol was recommended on one site, and another suggested peppermint oil as a deterrent). Mice tend to wander along the walls/straight lines, and tend to be habitual offenders. Apparently they don't often stray 20-30' from nests, so sometimes just moving the trailer a bit out of the established path can also help, per the rodent removal specialist who has been to my house in the past. Good luck!
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