Rusty. sorry for your solar problems. There have been problems so Renogy removed the Flex panels from their line up because they have been unable to find and rectify the problem.
They are giving folks there money back. You need to contact the Renogy factory,and talk with Tech support because they will need you to run tests with a multi-meter to verify the panel is bad and not the controller or the battery.
To Test out put yourself, park the truck in the sun at noon unplug the panel from the roof conector use a multi-meter to test the voltage. It should be between 15 - 16 volts (because it is glued to the roof). Normal is 19-20 volts.
You don't say the age of the camper. The batteries are warranted for 3 years. Any auto shop will be able to test the battery for you.