I'd finally had to put on the spare when the Trailer Kings wouldn't hold a plug in the sidewall. I was then running three different sizes. It was time to bite the bullet. $590.00 later...
They feel like they might hold a plug. But, you know, it's planet earth so there're, like, No Guarantees.
Thanks James. It's great to find someone who knows their stuff!
Discount Tire on N Vision Way a couple of miles south of New River, Arizona on interstate 17.