I've gotten around to coming back to this thread to address replies and questions.
John, I did see the motorcycle tire store on Agnew street mentioned in the phonebook, but I couldn't wait til Monday, so that was a no go.
There is a Cycle Gear around the NW part of Oklahoma City, specially at Northwest Expwy and N. May Ave. They were open on Sundays, and they do sell tires and mount them, as long as one takes them just the tire/rim assembly. The problem here was they didn't have a tire for the LT.
But, this is good info. to store in back of one's mental file cabinet for future reference. Cycle Gear is a chain of brick and mortar stores, and I think they have an online operation, as well. They carry a little bit of everything, though the quality of their merchandise isn't necessarily top shelf. They carry their own line of motorcycle apparel, including helmets, and therefore, priced well for those on a budget or needing something in a pinch/last moment.
I found one of their stores on the same trip in Albuquerque, where I was able to find my wife some riding boots and gloves. She just didn't want to spend the money the BMW dealership was asking for their boots. I can't say I blame her, but they did look like quality boots.
Anyway, here's a picture of the tire, revealing why I decided to end the trip 200 miles from home. I did carry a tire repair kit with me, as well as a can of "fix-a-flat", but these wouldn't help in this instance.
I'm guessing the main culprit was an incorrect tire pressure for the rear tire, thanks to my brain being on vacation, along with the rest of my body. I kept the tire pressure at the recommended 46 PSI for two-up riding/maximum load, but I forgot about pulling the trailer.
Should I have inflated the tire more with the trailer in tow? This is the only possibility I've came up with.
Here's another picture showing how badly we were roughing it while stranded.
We were drinking JD and coke, while waiting in the motel lobby for the calvary to arrive.