This PCL-18B mobile column lift system comes in a set of 2. When combined, the system lifts up to 36,000 lbs. A set of 2 is the perfect way to expand your lifting capabilities on vehicles with three or four axles. Sets of 4, 6 and 8 are also available. With a pair (2) of mobile column lifts, you can add to your existing fleet and expand your lifting capabilities to include larger semi-trucks and heavy-duty vehicles. A minimum of 4 mobile column lifts must be used to lift a vehicle, and heavier vehicles require 6 or 8. Do not attempt to lift half of a vehicle (the front or back only) with only 2 mobile lifts.