Those are GREAT generators. My brother has an EU2000 and he runs his A/C, coffee maker, microwave etc. in his camper with no problem. I think that you can link them together to produce more power. Very quiet and very reliable.
Wet weight would be what ever .61 gals. fuel weighs, say ~ ~ ~ 5 - 8 lbs +-
You are rite they are a super gen. ~ ~ ~ & very quite, lite, & portable, don't take up much room, ~ ~ ~
They can be linked together to produce twice the power, ~ ~ ~ special cables are available for parallel operation,