We put one of these on the tin boat trailer. Does what it's supposed to do, without being over engineered. Available under various names from Northern, eBay, etc. For the price, you can put a couple on, in key access areas.
Dang it, Spoony. A man can't keep any secrets.
Very similar to the Northland Whistler jig. Megabass is making a version also. I've made them on dart heads for years.
It's a slow chunk and wind bait, like a grub or swimbait. Brown fish will eat it.