Most folks with the 212 have gone over to the 215 for ease of installation.
3 camera unit should not be needed. The coach should have a camera controller, mine is under the top of the dash, where the three cameras plug into and then there is one RCA style cable that plugs into the radio. The camera controller is what determines which camera signal to send to the radio.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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