Go over to a local farm supply and get two white fiberglass electric fence posts and a pack of castration rings. Sealer rings or a heavy elastic band or even electrical tape would work too, but the castration rings help recoup your cred after just buying two posts.Expect to hear some 20 feet of fence jokes. Cheaper and better than the bungie corded versions, and when you're calling coyotes there's no big advantage to something that breaks down. They're also already white, and functionally indestructible.
Another thing is nobody ever stole a fence post off the back of a pickup before.
That just made me cry with laughter, Dogleg - great idea!