...just purchased a set for my 22' travel trailer & it wasn't easy to find them. (The factory installed "C-bombs" have lasted almost 5 years and still look "new", but I'm confident that I was living on borrowed time with them.) I'd wanted Goodyear Endurance, but some family health issues had delayed getting a "rountoit" for the past few months. Fast forward to this week & my local Discount Tire couldn't find my size Endurance at
any of their dealers nor at any warehouses contacted. A call direct to Goodyear indicated that they project shipping in
November(!). DT did find a set of Carlisles, and my hasty research indicated that they are (at least?) "second best" to the USA manufactured Endurance tires. The Maxxis brand "scores" closely, too, and I'm sure their are others. Incidentally, I did opt to move up to Load Range "D" as the trailer came with "Cs" -- just barely enough load carrying for real world trailer/cargo weights. I've learned of no issues with Carlisle tires with disclaimers being that I have little experience
so far...and, of course, we all realize that proper pressures and maintenance is vital for trailer towing use/dependability. FWIW.