The biggest equipment that I could see running in the field would be a small air compressor, and thinking of the 20 gallon I have in the shop runs on a 15 amp 110VAC circuit, that's roughly 1800 watts full load. Other than that, it would be a handful of lights in the camper, and occasionally recharging batteries as I too, like RoyB, am a ham radio guy. Realistically, if I dropped the ability to run a compressor, I could likely easily get by on a 1K watt generator....which considering I carry a compressor on my 4x4 crawler, it's not an absolute need to have one on the truck too.
While I know I could get the jobsite generator considerably cheaper, as others noted, those suckers are LOUD, even when they're out in the open, and it will only be worse inside of a metal box...and well, I don't want to have to listen to THAT, lol.
