I need to power up a 100 amp panel on a new detached RV garage from my existing 200 amp panel. What size wires (2 hots, 1 neutral) would be thecorrect size to run over a 240 feet span between panels? the panel will be grounded from the new foundation . I will be using a 50 amp RV hook up and just basic electricity for a 2300 sq.ft garage. Your help is greatly appreciated.Thanks.