Recently have been dry-camping in Colo Forest Svc campground. Other couples with us have a Honda 2000 and a 3000. 2000 did very well for charging batteries and running everything but AC. 3000 would run 1 AC, tho it was needed only one day when trailer was closed up all day. 2000 is light enough to carry; 3000 needs two people to carry.
One thing we learned---batteries are charged much quicker, more fully, when using a digital battery charger run by the generator rather than the battery charger built into the generator, or using the gen to supply power to the trailer converter. And the gen needs to be on "regular" mode, not the "eco" mode.
No experience with Yamaha or any others.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired