I have the Lippert jack system on my Damon Challenger, and it failed during the first two months of ownership. I had it replaced under warranty and made certain that the new pump (that was the problem; it was leaking fluid and shorting out the pump motor) would be warranteed from the date of installation. I found that Lippert was great to work with, but they have certainly had their share of problems with the leveling system, again mostly it seems, with leakage and shorting as mine did.
I would think that most other systems could be installed, but probably quite expensive. What about a salvaged system from a wrecked class A? I would think that a competent shop could do the work successfully.
Best of luck, Bronk