Features; For 18 wheelers, RV’s, commercial vehicles and trailers; Works with 95% of vehicles 2 1/2 tons and higher; Precise axle & wheel alignment; All measurements can be made quickly; Multipurpose measurement capabilities; Compact design; Can align a fully loaded vehicle; Aligns drop and tag axles; Kit Includes: 4 lasers; 2 fifth wheel pin adapters; 2 drive wheel adapters; two steer wheel bars; tape measure; software package