Uncle Ned, i also have the Level It setup except that i don't have any hydraulic jacks, just the air bag controls. I also have a toggle switch so i can choose between manual and hiway, but don't know if the hiway function works as i have always just left it on manual. Might have to try it next trip and see if it works......if i can remember to switch it
Other than that it has worked well for me and the PO. No idea how old the setup is, we have had the bus for 6 years and he had it for 20 years before that.