Thanks sayoung. I did reach out to them and got the response below. If I can't integrate into their auto-level system, I'd prefer to go electric instead of adding another hydrolic system.
From their support:
I have a question first, are you wanting to integrate the rear jacks and the front jacks and run them all from one control system? If so then you will have to purchase a full 4 point leveling system from us. We can’t integrate with jacks from another system. If you are good with what you have and only want to replace the rear 2 jacks and are ok with just running those off of a control system, then we do have 2 point systems that we could sell you.