Well, I shouldn't have just ignored when I first saw them around the ground outside the MH. Seen them while doing outside maintenance and washing. Some were on the power cord from the outside box into...
Food grade diatomaceous earth. It's very inexpensive, non-toxic to pets and easy to find. We get ours at Home Depot in the garden department. I even use it in the veggie beds to eliminate the little creepy crawlies that eat up the seedlings. It even gets those pesky slugs, but doesn't harm the earthworms.