5TH WHEEL RAIL KIT 15-26 F150MAX DUTY 5TH WHEEL TRAILER HITCH RAIL KIT ; 15 26 F150 The REESE Max Duty Underbed Mounting System installs below the bed of your pickup, giving you the flexibility to use your truck however you want, whenever you want. Towing with a 5th wheel hitch, hauling with a gooseneck hitch, or using your truck bed free of permanent rails when not towing! The Max Duty is the ONLY towing system of its kind for half ton trucks. With a weight rating of 14,000