I started off with a Yamaha EF2400is. Just light enough to move around for one person (short distances) but the tank always lasted me exactly 8 hours, not quite enough on days I wanted to sleep in. I was also worried about getting enough power from it for future trips to 8000+ feet in the Rockies (at 8000 feet you lose almost 25% of the engine and electrical power, more if you don't re-jet it).
I considered the twin Hondas, the thought of using one when needed, having a built-in backup, and easily moving them around were pluses. However, I wanted 10+ hours of runtime w/o putting together an external tank, and the lighter generators meant it would be easier for them to be stolen.
I ended up with the Honda EU3000is. Too heavy to be moved around, so harder for it to walk off. No issues last summer at high altitudes. And it lasts longer than our longest stop at truck stops, over 12 hours. I ran the majority of our house as a test and it wasn't done when I stopped it at 21 hours.
2008 FR Salem 26TBUD
2010 FR R-Pod 171 (2009-2015)
2010 Chevy Suburban
Honda EU3000is inverter-generator