F-RS: Priced per section. Adjustable from 2'-8', 3 leg sets/unit, 7 wheels/axle, 200 lbs./ft. capacity F-RS12: Adjustable from 3' - 12 '. 4 leg sets/unit. F-RS16: Adjustable from 4' 3" - 16' 9". 5 leg sets/units.