Gladiator 23580R16 ST 235/80R16 STEEL BELTED REINFORCED Radial Trailer Truck Tire 12 Ply 12pr 16 Inch 16 " ST235 80R R16 Load Range F inches brand new Gladiator 12 ply Trailer tires ST 12 PR 16 inch in 16" 12 ply rating 16 " Load range G API Pegasus Achilles 3640/3200 SRW/DRW weight rating