Hilo lift system
It was a standard Hilo lift system, consisting of a 12 volt hydraulic pump located in the front of the trailer and a hydraulic cylinder, mounted left to right under the trailer. There are 4 cables that connect to the drivers side frame under the trailer which are routed thru 4 pulleys connected to the end of the hydraulic cylinder. The cables are then routed to pulleys at the four lift points, up to the top of the lower section thru another pulley and down to the bottom of the upper section. The cylinder is connected to provide a 1 to 2 mechanical advantage. In other words the cylinder moves 1 foot and the cables move 2 feet. There is also a metal safety rod that drops down when the hydraulic cylinder is fully extend to prevent the cylinder from slowly retracting and the top from slowly lowering. The hydraulic motor is operated by a switch just inside the entry door. To lower the top you have to first lift it a little to take pressure of the safety rod, pull a cable to hold the safety rod up then press the lower button.
I am sure there are some mechanical schematics available on web which would provide a visual description.
Hope this helps.
Your heirs will inherit money and stuff when you are gone. You can only save or spend money, but you can do things with stuff, so they are going to inherit stuff!