There are a few different ways that you can reset a GFCI on a camper. One way is to simply unplug the camper from the power source and then plug it back in. This will typically reset the GFCI. Another way is to flip the breaker switch for the GFCI. Finally, you can also press the reset button on the GFCI itself. If none of these methods work, then you may need to replace the GFCI.