Extended Ramp Chocks For SM300-200 and SM30 Series Lifts. Provides 33? Longer Ramp Length Than Standard To Reduce Ramp Up Angle For Passenger Cars And Motor Homes With Low Ground Clearances. Ramps measure 72�. For SM300-100 Series Lifts, Order # FC5254-12. NOTE: $698 adder when ordered with lift in place of standard ramps. 2 are required and the price shown is for one.