Do you really need a 50a extension? Expensive to buy and heavy to tote around. On the rare occasion an extension is needed, a 30a works for me. I think you will find many others do likewise.
Adapters with handles are good to have, IMHO. Camco brand I think I have. My 30a extension is just whatever was cheapest when I bought it years and multiple coaches ago, due to infrequent use.
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.