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Yes your right 4 gauge is correct, I need 130 foot through my attic and through attic in garage and I want to put a Junction box In my garage then 30 foot to bus building. I need 130 of romex 3 wires and a ground, Is that called 4-3 ? then 30 foot of stranded to go through the conduit to bus. I wired this years ago 30 amp with a 30 amp plug and it doesn’t cut it, When I did this we had a camper and it was kept outside and a Foretravel and 2 Prevost later I want to do this the right way. My friend said I could use aluminum wire If done correctly he said it’s 1/4 of the price! But I think I will buy copper?? What do you guys think??