This is many years later, but for those trying to keep their LBX going, I found a replacement power supply by searching the part # off the unit itself. electrokit.com had a match and for $15 US, and $14 shipping, I'm getting a new one. I will let you know if it worked.
The system I have worked with or on used "Pancake" cylinders form McMaster Carr. Typically the cylinder has a 1" throw, mounter to the wagon, and the theaded ram can have a stem type caster that lifts the load onto wheels, or a rubberized stem that serves as a brake for the unit. 1/8" - 1/4"...