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You might check the specs of both units to see what each leg is actually putting out. The junction box on all the units with a 5500 is rated for 30 amps. There is a post of mine on the forum that gives the exact rating per leg for a 5500 which is less than thirty amps there for allowing Keystone to use the 30 amp rated junction box and 10awg wire. The 6500 might require bigger wire and a better box. Can't tell you much about the transfer switch other than mine hums quite loudly when plugged into shore power. As stated before it is supposed to be able to run both AC units with some extra left over. Better look at upgrading your tanks to at least 40's as the tanks go dry quite quickly. My connection from the generator to the 10awqpg in the junction box nearly caught fire. All the tape was burnt off and or melted along with the wire nuts. Could have been real ugly, lucky it was a metal box and it was so hot you couldn't touch it with your bare hands. Be careful whichever way you go and it wouldn't hurt to double check the installation.
Tom Marty
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