OK, so I now understand my suicide cord suggestion was pretty nuts. I'll be wiring up the generator on the 120V side though an IOTA transfer switch (the other input coming from shore power).
Unfortuntely, my Xantrex doesn't have hardware terminals on the AC side (despite being 2000W) but rather a dual GFCI outlet. I want to keep the GFCI functionality, so I think the best option is a quality 3-prong plug into the inverter, with the other end hardwired into the transfer switch?
Most plugs seem to be designed for normal 15A household circuits, but it seems like for 2000W I should be looking for something capable of 20A, and probably 12 AWG?
I found this:
12 AWG pigtailbut not much else yet. It only claims up to 15A, but it does claim to be 12 AWG. I can find extension cords that are 12 AWG and cheaper - perhaps it makes more sense just to buy one of those and chop the female end off?