I came up with what I thought was a nifty sign wording but my wife said it wasn't friendly so it didn't get posted.
Caution, severe tire damage possible.
Your tire, my rifle.
I like the official looking signs as well as the we don't call 911 and similar signs. One guy near here put up signs warning of intermittent radiation hazard comprised of intense invisible ultra violet and other radiation known to cause cancer, glaucoma, and other visual problems. Some do gooder fearing for the safety of children who might trespass called the county mounties who came to investigate. The property owner said the intermittent radiation source was the sun and that the claims made on his sign were backed by well accepted science. The county mounty got the tongue in cheek nature of the warning sign and did nothing. I think it is a hoot.
Patrick