We will just have to see if the ST Tow Stars hold up or not.
I always do a walk around before setting out and saw nothing with the tires but in the future and will be doing a closer inspection before heading out.
I do a pre trip tire inspection each day when were on the move but I also use my old tire thumper and a visual every time I stop the rig and get out of the truck for fuel or potty break.
The tread on that tire looks ballooned...and can be from tread delam. Typical older tech ST C/D/E poly tire that sat most of its life.
My 2 year old pre owned '97 32' 5th wheel trailer came with new ST225/75-15 D Marathons on 6 lug wheels.
Back then I didn't use ST tires on my service trailers so I sold the set (4) to a neighbor for his farm trailer.
Went with 16" 6 lug wheels and BFG Commercial T/A LT215/85-16 E at 2680 lbs capacity. The set ran for 7 years and 55k miles. The second set ran for another 7 years and 52k miles all with no issues.
Looking around rv websites I see the Endurance...Providers...Carlisle HD ST C/D/E tires seem to have much better service records than the older ST tires when they were all made in the USA and later made in china ST tires.