Specifications include, but are not limited to: Unit must be in the 110 net and 120 gross horsepower class (82 kW to 89 kW), four-wheel drive, rigid frame, hydrostatic ground drive, quad track system/tire interchangeability, four wheel steer, hydrostatic attachment drive, riding unit. Basic unit must have a minimum operating weight of 9,340 Ib. (4236.6 kg) when equipped with tires and 6-way backfill blade. Length of basic unit must not exceed 13.1" (4 m) when equipped with tires and 6-way backfill blade. Maximum operating height must be 109" (276.9 cm) when equipped with a 2-post rollover protective structure (ROPS), 112" (284.5 cm) when equipped with a 4-post ROPS. Maximum backfill blade lift above ground must be 16" (40.6 cm) and a minimum angle of approach must be 22o with backfill blade fully raised with 38 x 18 x 20-inch (96.6 x 45.9 x 50.8 cm) tires. Unit shall be a maximum of 86" (218.4 cm) wide when equipped with tires. A unit which appears to meet the minimum requirements of this detailed specification is the Vermeer RTX 1250.