I've looked at what it takes to make everything work. Doesn't look too bad but would be a lot of wiring. The system apparently uses CAN bus to deliver signals between everything (basically two wires and I believe they can be chained).
Here's the link for the OneControl (formally MyRV) system:
https://support.lci1.com/onecontrol-...-formerly-myrv
The components tab shows what the system can include. To make an existing system wifi I think you would need Part "406343 Wifi Gateway Hub"
https://store.lci1.com/onecontrol-wi...ub-406343.html, current $349, and then run wires to something, not sure what.
You should have one of the Leveling Controller's already installed if you can control the leveling system from the tablet.