The rear steer in the jeep is 12 volt electric over hydraulic, I tossed it together on the cheap with parts I had and could buy cheap....northern hydraulics ram and log splitter valve, and the pump is just one I had laying around, I put a main on off switch on it, I have about 300$ into it and its worked for years that way as a trail rig but it draws a lot of juice and is kinda slow, I would like to add a second power steering pump but initially when I built it ,I liked the idea of two totally different systems in case of failure on the trail... The Toyota truggy is basically the same system with a better electric over hydaulic pump, they both seem to work great but they arnt fast , if I rear steer the buggy I will have two power steering pumps and a better valve for increased speed....both ways seem to work good, just preference , budget and what ya use the rig for