I run mostly a 14 gauge wire, but I also when plugged in at home use a 12 Gauge cord, so get a good 12 Gauge and you should be alright.

I should add that in some places my cord on fifth wheel is long enough for most times I plug into generator.

"The 375HH is the greatest level of power you can get for the investment in recoil." (JJHack)
79s and losttrail, biggest waste of air.