Available are four Goodyear Endurance radial trailer tires - size ST215 75R14 Load Range D. These were on a boat trailer that was mostly stored indoors when not in use. There is plenty of tread and no patches or punctures. The tires are in nice shape.
The tires were new the last half of 2019 when I bought a new boat trailer for my boat in October 2019, so they have a 2019 DOT date. These are radial trailer tires, not bias ply.
Goodyear describes their tire as the following:
The Endurance is Goodyear's special purpose trailer tire developed specifically for use on travel trailers, pop-up campers, boat trailers, toy haulers and fifth wheels. Endurance trailer tires are designed with durability in mind to help make towing a trailer less stressful by reducing impact-related failures experienced during use.
Endurance trailer tires feature a rounded profile to help cushion the trailer's ride, and the symmetric tread design with closely spaced ribs provide constant rubber-to-road contact for straight tracking, dependable highway stability and long-lasting wear. The tire's internal structure includes twin steel belts with a two-ply nylon reinforcement to stabilize the tread, increasing traction and durability. The Endurance features a polyester cord body to help smooth out the trailer's ride, and a scuff guard is molded into the sidewall to further increase durability by resisting damage from contact with curbs during parking lot maneuvers.
New on Tirerack or Discount Tire these are at least $180/tire plus tax and mounting.
The used tires go for $50 a piece. Or $200 for all. Cash is king.