Well...with the Onan and 2 AC's you have a 50 amp coach...so you will need a 50 to 30 adapter at least and you may also want to get a 30 to 15 so you can plug into household current.
NEVER run both AC's on anything less than the 50 amp cord. Never run anything with a motor in it or any heavy loads on the 15 amp plug. One thing at a time on 15 amps. Anything but the air conditioners on 30amps...though you might be able to run ONE and nothing else.
2015 Georgetown 280DS
2014 Vespa LX150 2014 StellaAuto 125