I just use a good quality 100 heavy duty regular extension cord to the coach. Leaving the 50a cord in the power bay with adapter there n the power bay. Lighter to handle, no connection to the weather, etc.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.