hphock

I wasn't very clear. The exterior box was previously wired for 50 amps from our breaker box. An electrician put in a Home Depot 50 AMP RV outlet since it was already wired for 50 amps from the hot tub.

I'll get a pic of the outlet. I like the idea of reconfiguring a 30 AMP cable with a 50 amp male plug, using one HOT, Neutral and ground. Could I pull the tooth of the HOT not in use? The cable would stay at home and be wound up sorta like a garden hose on the wall when not in use and not plugged in to the outlet. What we want is to be able to run the fridge a few days prior to get it cool, keep the coach batteries charged, and in the summer, run the AC on low to keep the humidity down.

What is the difference between the adapter above and this: https://smile.amazon.com/gp/product/B07C8C33YV/ref=crt_ewc_img_dp_2?ie=UTF8&psc=1&smid=APF2F3A4Z2HBN

I was hoping to find a 25 foot cord to go from a 50 amp wall box to my 30 amp RV. I see dog bones galore but why is there no 25' cable so I don't need the dogbone? If I were to make one, how might I wire it since the 50 amp has 2 hot, a ground and a neutral and the 30 amp has ground, neutral and only 1 hot wire? I ask as we have an a 50 amp box where our hot tub used to be and its only 20 feet from where we park the RV.