members 106 as shown in fig3 the piston 16 carries a pulley 108 on its upper end and the pulley 108 receives a cable 110 the cable 110 is locked near the bottom of the cylinder into a plate 111 and also locked into the uppermost telescoping member 112 the uppermost telescoping member 112 is affixed to the camper top 14 and the lowermost telescoping member 113 is held by a tab 118 locked into the plate 111 by a pin 120 as fluid enters the lifting member 12 the piston 16 extends and raises the pulley 108 this pulls the cable 110 upward and raises the top 14 each of the fluid lines 22 are connected to a flow control valve 24 as shown in fig4 5 6 7 11 12 the flow control valve 24 limits the rate of fluid flow leaving the chamber 20 of the lifting member 12 to which it is connected the flow control valve 24 has a housing 31 that has an inner sleeve 33 mounted therein the inner sleeve 33 has holes 34 through which fluid may pass a spool 37 is slidably retained in the inner sleeve 33 the spool 37 receives a spring 39 in one end the opposite end of the spool 37 has an.