What is that actually a picture of? Your shore power cable? Does it have the same pin configurations on both ends?
It's not uncommon for an RV to have that sort of connector on the side of the RV, and a shore power cord that has that on one end and the other kind (two flat pins, one round pin) on the other. The two flat/one round is what you plug into at a campground.
2008 King Aire 4562, Spartan K3(GT) w/ Cummins ISX 600
2014 Jeep Grand Cherokee Overland 5.7L V8 Hemi w/ Blue Ox Aventa LX Tow Bar and baseplate, SMI Air Force One brake