Any brand will be fine. They are all the same. You need to by the one that Matches your RV 50 or 30 amp. You can throw the 20 for convenience of other uses if you wish. Some do the 50 just for future up grade if needed. you can install a 50 and plug in a 30 using dog bone adapter. Amazon, HD, Lowe's has all you need. 50 ampis 240 volts 4 wire. 30 amps is 120 volts 3 wire.
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2011 Keystone Sprinter 323BHS. Retired Master Electrician. All Motor Homes are RV's. All RV's are not Motor Homes.
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