How many ply are Goodyear endurance tires?

The tire’s internal structure includes twin steel belts with a two-ply nylon reinforcement to stabilize the tread, increasing traction and durability.

Is Goodyear endurance a 10 ply tire?

Goodyear Endurance ST 235/80R16 123N E (10 Ply) Trailer Tire.

Did Goodyear discontinue endurance?

According to them they are now “discontinued” no longer available.

What PSI should I run my Goodyear endurance trailer tires?

If you are between 3,761lbs and 4,040lbs with your trailer, than 45PSI would be what I recommend using. Remember that this is a cold inflation pressure that should only be checked before driving, as the tire pressure will increase as your tire gets up to operating temperature.