I may be going slightly off topic here, but having seen the video showing the steering box separating from the frame arouses my curiosity. The video makes me think that there are no compression tubes inside the frame for the bolts to pass through, and that the outboard side of the frame is...
1) Using the Genesis dual battery system is an excellent idea so that the refrigerator is not powered by your starting battery.
2) The Odyssey batteries that Genesis sells are pricy, but typically have twice the service life compared with the "maintenance free" batteries commonly used in...
The electrohydraulic steering probably would have insufficient flow rate or duty cycle to power a hydraulic winch. You would likely need to add an engine driven steering or hydraulic pump.