Mice infested first winter of storage

We have a 2018 2970 RL, and the 2nd winter we stored on the property we currently use it on and we got infested. They didn't ruin much more than some quilts and chewed a hole in the plastic foot rest cover on the recliner.
Since then, we use Moen's Mouse Mix packs, probably about 13 of them inside. When we arrive for a weekend we put Mouse Mix packs in a container. I think the bigger helper is spraying Tomcat Rodent Repellent around the perimeter of the trailer, along with Bonide Repels All. I spray the stabilizers, the wheels, anything that touches the ground.
As for plugging all the holes, it's impossible. Look at your curbside rack and pinion slide mechanism. See how those racks go through the big holes in the frame? You can't seal those. I took out the drawers of the closet thing in the bedroom, , where you access your water heater valves. There was like a 6 inch hole through the floor where they ran tubing and wires. I used a combination of brass wool/expanded brass and expando foam. First I filled the whole with the expanded brass, then back filled that with the expando foam.

In our 2970 we found the main point of entry was the furnace. Outside where the sewer dump is, there was a pretty big gaping hole where they sort of bent the coroplast around the sewer pipe. After I sealed that up, that helped tremendously. The other point of entry we've found is the back corner of the dinette/recliner slide. Why there? I have no idea. We place sticky pads at all corners of the slides, and 3 o4 of them on the floor where the return air goes back to the furnace. That's' how we found out where they were coming in.

As for the two holes in the corners of the Street/schwintek slide. I modified mine by using two two sizes of flexible split loom. A size that fits the hole, and a smaller size that fits inside the larger split loom. All told probably 6" inches long. I siliconed the two sizes of split loom together, and then siliconed the larger diameter split loom to the base of the drain. This way I still have a functioning drain, albeit I've never seen water there. That said, one winter Sunday afternoon I visited my Grand Design dealer, my mission was to look at Imagine trailers with Schwintek slides that would have that open holed drain at each corner.
Basically what I found was, it seemed like it came down to which operator was running the caulking guns and or who cared. I probably looked at 7 trailers. I found a mix of, some had the holes caulked shut with grey caulk, some were caulked shut with black caulk, and some were open.
 
After having a short discussion with my wife about mice in the trailer, ( ok, I just listened lol). I pulled all of the air and heat vents on the floor and put in smaller mesh behind the covers. Also small mesh around all plumbing points leading from the storage areas to the living area. We also put the cloth wheel covers on the tires and spray them with peppermint oil. And just to tempt them I place traps with peanut butter on the top of the wheel covers. I also placed a trap in the basement and have not count a single mouse with it. As a friend said, thin them down before they get in. We have had good luck with this. We do store our rv at home and so I am able to check the traps on a regular basis.
 
If you look on Amazon and search for stainless steel pads. They are tougher and don't rust ever.
 
The grand design is not so grand.

I have a 2015 Reflection, which I really like but after an infestation over the winter I vowed to stop it once and for all. So... I just spent 3 weeks rebuilding the entire bottom of my RV. I originally dropped the underbelly so I could try to "mouseproof" the vehicle but what I found was much, much worse than imagined. The problem is not that the mice are unstoppable, the problem really is that the people putting these things together most likely do not care. There are so many wide open holes going up through the floor, into the walls, into the frame, wires routed under the frame through the chloroplast and back up again because someone was obviously too lazy to go through the precut hole in the frame 6 inches away (in 3 places!!), cheaply spliced wires throughout, shoddy workmanship nearly everywhere including heating, ventilation, electrical, etc. and clearly the cheapest possible materials have been used (even dryer vent material is better than what they used for the heating ducts, which was like aluminum foil). I am really disappointed and quite frankly disgusted with the entire industry in general. If they wanted to build it well and keep out the rodents it is definitely doable, and probably would be a similar price point, but you need to want it to happen. We've been to the moon but can't keep a mouse out of a vehicle? Come on... It is that they have no impetus to do that, they would rather just sell you a new camper.
 
We so far have solved the problem by storing our RV in a local farmers equipment barn where they keep multi-million dollar farm equipment. They do NOT want mice in those things. They get the barn sprayed etc quite often by the local pest control company. Been storing there since 2018 and so far zero mice.

We also stuff bounce sheets everywhere just to be safe.
 

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