IF I'm envisioning it right the bottom of the plugin section looks like the depiction below with the notches open and the black parts are sheet metal. This is not on the cover, so that you could just leave it open.
The 30 amp receptacle is behind the center part, and you have to either bend the center section down or try to bend the cable right or left right right out of the plug and then it tends to partially unplug the plug.
Salem 29RKSS Pushing a 2500 Mega-Cab CTD!
Gotta go campin!