I recently Purchased A pair of Boxes off of RCP Reg ..one a pup so i figure i would try to desing a hoist for it ..decided to try out the firgelli cyclinders ..Im using the 50 mm 150 rpm 12 volt ..rated to lift 40 lbs ..Thanks for hooking me up Ian ..I also purchased the remote control with keychain ..this way the pup will be independant ..heres waht i have come up with so far