D120 - Brk Axle, HF= 72, 12 1/4x5, Air, Flg-***OIL HUBS***, 5.00 Tube, Std Bkts, 24/30, 16.38 Cam, 28 Spline, Auto Slk, Strt, Tramec, A/C ROD LEN.(TO CLEVIS)=5.62, 8-6.50 Hi-Pro, H&D W/ABS, 5/8-18 Stud, Aluminum Bolton Fortress Cap, Sprg Seats,Ship Loose, 3.00 Wide, STD AIR CHAMBER ORIENTATION, Calculate hubface & spring c., Calculate Leaf Sp Capacity