the Victor boxes don't work in Iowa. It's so cold here the mice beat you back into the house after you release them.
We had a problem with Rafter Rats eating the wiring in the engine compartment of our first bus. I used Pet Safe boxes loaded with decon in the area and put cotton balls loaded with Pepermint Extract in and around the wiring locations near the engine. They love crawling next to your warm engine if you use the block heater. Good luck.
Harry
Shirley & Harry / 2000 Liberty / 2008 GMC Envoy Denali
you're "all bad" ( but with good ideas)
Got one mouse with trap the first night back. Also got some of those sonic plug-ins to hopefully keep them away. I haven't seen evidence of any more, so keeping my fingers crossed. I don't keep the engine block heater plugged in, so hopefully I wont get any rodents there either. Took the coach on it's montly maintenance run, all went smooth, and would think it would help dislodge any varmints too.