50a electrical plugs?

[Ryan Wright]

Speaking of electrical connections, I have a bit of a dilemma: My
50amp cord is not long enough to reach my service point. I have some
questions:

1. Where can I buy a 50 amp coach-side plug that will fit in the
outlet? I bought one that is "right" as far as the electrical contacts
are concerned, but the plug body was too thick and hit the "ceiling"
in the electrical hookup compartment. I don't want to steal the plug
off my factory cord - would prefer to keep that in the coach for
traveling and build a new cord I can leave at home.

2. Why doesn't anyone sell a 50 foot, 50 amp cord? I see lots of 50
foot 30 amps but no 50ft/50a. Will I have a problem if I make one? I
understand voltage drop but I currently have my factory cord plugged
into a 25 foot, 50 amp extension cord, and it works fine. I have to
hide the connection point between the two cords under the coach to
keep it from getting wet if it rains, though, so the situation is not
ideal.

3. Alternatively, I am considering putting a 50 amp input receptacle
on the other side of the coach. I'd still want the factory receptacle
live, though. Any advice on how I might accomplish the tie in & where
to route wires? I'm betting I would need to install an auto-transfer
switch to make this safe and/or to code, as I know I can't just tie
two sets of wires to the same lugs. I'd have done this by now but I
can't even find how to access the existing wires feeding the coach
electrical panel. Where / how do they route to the connector?

Lots of hard questions. Appreciate any advice.

-Ryan
'86 PT-40 8V92