The tire theif was probably a power boater.
Now that's pretty low. But your probably right, how many trailer sailboats do you actually see at a ramp?
A couple of years ago we had a travel trailer and I spent a lot of time on the RV forum reading about trailer weights and blowouts. You'd be suprised how close the tires are maxed out and how many drive overweight and know it. Especially the truck camper guys pulling trailers. Some are way over.
One thing I did learn is everybody that trailers a boat or anything else should weigh it. Maybe there should be an endorsement on the drivers license to be able to trailer. Something simple that would make people realize how dangerous trailering really is.