This is off the top of my head, but if you have the rig in neutral or drive you can press the CH- button on the monitor. You may have to push it a couple of times to get the display you want. If you put it in reverse, the system will change to the rear camera and you can't change the display.
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2007 Fleetwood Excursion 40E
2007 Chev Classic CC LB D/A - Toad 
2013 Jeep Sahara Unlimited - Backup Toad
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