Was doing some "window" shopping on Camping World site, and saw a dogbone for dual 30 amp to a single 50 amp receptacle. Are there actually RV's that have 2 30 amp hookups??
Some have installed a second circuit for more power. The adapter you saw will allow a 50A RV to plug into two 30A plugs or 30A and 20A which provides more power than a 30/50 adapter.
There are many posts on this subject. While it can be useful there are pitfalls that can occur. Best to avoid this adapter.
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