Converting to Electric Roof Lift?

Correct - Heco sissor lift, and it is the first foot of rise which presents the problem. I looked at a lot of options before I built because I didn't find anything 'off the shelf' that I thought would work, though these hatch lifts might. I considered electric, pneumatic & hydraulic (though a leaky hydraulic would create quite a mess). I never found an air lift jack that had the right dimensions and would give me over one foot of lift. You have to mount these things someplace. My air bags sit on the same level as the base of the bed, which gives a well about 9 inches deep. From there the device has to lift maybe 20 inches in order to do any good. If the hatch lifts are less than a foot long when collapsed, can be mounted upright to push on the roof, and then give the roof a lift of over 12 inches, then it ought to work. My air bags work, but are not ideal. I'd like to find an accordion - like bag that will fully collapse down into the well. Tom McCloud