Are you talking about a pull out cord or one that connects to a RECEPTACLE behind a locked door...
Most 50AMP SHore Power cable use this method where the cable disconnects from the trailer end...
Alot of 30AMP Shore Power Cables use this method that get pushed back into the trailer end but can also be like the above photo and be disconnected. My 30AMP trailer uses the push-in-the-hole method
You may have to install a square hatch door like this to push your large 50AMP shore power cable connector through the door if you have the 50AMP pull-out cable.
We have been to several camp sites that only have the 30AMP Pedestal Service available. Only a few where we always go seem to have both 30A and 50A Service on the pedestals.
May we ask why you are so concerned doing the "stealth mode" whatever that means.
Roy Ken