Flat tire on SW Truck while carrying a TC?

Back in the 30's, my 30's, which was the 1980's, I had a light duty F250. It had 7.50x16 tube type tires. I had a Tejas 8.5 ft cabover on it. No clue what it weighed. I didn't know what a CAT scale was. Had a flat on I-25 crossing Platte River at Douglas WY. I didn't know I had a flat. A passing car was pointing at it. No drama that I recall.
There is a do-dad that fits over the top of a jack that has a half circle welded to it to fit an axle better. I think I saw it on Amazon. Didn't want to pay their price. A short pipe nipple welded to half of a 3 inch?? pipe would work.