being experienced in this with multiple trailers and generators - I would recommend the Yamaha 3000sieb , has wheels - and handles, easier to maneuver/lift than the 3000is, will run 8-10 hrs on tank with 15k a/c on high as well as a converter/charger and a few other items, longer with just a/c on auto- also you can look at a 3000i handi Honda- lighter- 1 person lift, runs 15k and res fridge, converter as well as sat dish and tvs and computer in my bighorn, have had the 3000is, still have the Yamaha in my race car trailer, had a eu7000is with my previous travl trailer , ater having 2of th 3000 handi its were more hassels with fueling all the time - kept one of the 3000 handi an take wit me I bighorn as spare in case issue with onan, and use to power when its cool and don't need both a/ units- the 2ks Honda have too small tank and by the time you get external tank setup and 2 units- I think you would be happier with the 3k Yamaha- and the b boost model uses th onboard bttery to help boost output for a short period - the champions are also a option with dual fuel units and 3400 watts , but running a landmark and 1 a/ they really drink gas and are not as quiet as Hondas or yamahas - real world testing running-
ask your friends you will be camping with - had my bighorn a little over a year and 412hrs on new 7k onan -- I use mine as many racetracks do not have hookups