On my 2013 Eagle, the switch is located by the LP tanks in the lower right (street side) just behind the cover for the LP tanks.
It is a very small rocker switch.
This is the opposite side, but in the same general area:
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HAPPY CAMPING!! :D
Daryl and Sandy
2013 Eagle 314BDS
2014 Ford F150 Platinum, 4 x 4 Crew Cab with Ecoboost
Equal-i-zer Hitch
like Gcloss, mine has a rocker switch on the bottom of the fiberglass cap, right next to the propane hatch. But that's on a trailer. There might be a rocker switch in a similar spot on your fifth wheel.
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2013 Eagle 266RKS
2011 Ford F-150 w/3.5L Ecoboost & H.D. Tow Package