I bought a single Yamaha 2000 because I was looking for something to run a few things on our houseboat, and I got it at a very good price.
I quickly found out that it would not run everything I wanted, so I bought a 2nd, and run them in parallel.
The Yamahas have been very good and reliable (probably put around 150 hours/year on them, and have had them for at least 6 years. But if I were to do it again, I would buy Hondas for the simple reason that they are much easier to get an extended run fuel tank for. Without fuel pumps on the Yamahas, that does not work very well.
My gens need to be filled about every 8 hours or so. That is a mix of running eco mode and full bore to get the inverter going, microwave, battery chargers, and whatever else is the basic operations of our boat.
2012 RAM 3500 Laramie Longhorn DRW CC 4x4 Max Tow, Cummins HO, 60 gallon RDS aux fuel tank, Reese 18k Elite hitch
2003 Dodge Ram 3500 QC SB 4x4 Cummins HO NV5600 with Smarty JR, Jacobs EB (sold)
2002 Gulf Stream Sea Hawk 29FRB with Honda EV6010