USB charging ports are pretty simple.
You can check the fuse with an ohm-meter, then re-seat it. That should probably be the first step
If you can remove the panel and get behind it you should be able to measure a 5V input across the leads going into the connectors.
If not, then follow the wires back.
2012 RAM 2500 Megacab Laramie Diesel
2016 Jayco Eagle 284BHBE
ProPride 3P WDH