I'm sure other folks have sung the praises of
HatchLift | Hydraulic Lift Kits | Rv Hatch Lifts | Hatch Hinges here, but I'm going to anyways.
I installed one of their kits in my hot rod yesterday and really like it. They are not difficult to install. They make kits for RV compartments, kitchen cabinets and beds, regular beds, truck tonneau covers, and creative types can think of other uses, like what I did.
Great customer support as well.
Frank