i'm converting a cargo trailer in to a camper. i need an electric power input plug / connector, Nema L14-30P male receptacle. i'd like to find a flange type with a flip up cover. i've been to a local r/v dealer that has a parts dept. they couldn't help. i have an extension cord that has this connection for my generator, now i just need the connection for the trailer. i can find this kind... but it doesn't match my cord. i'm on a budget so paying a hundred bucks for a new cord is out. any ideas on where i might find this?