It all depends on what "stuff" you want to run, and how much weight you want to carry, and what campgrounds you are going to without power, and their rules.
I'll try and explain. A Honda 2000 watt is light, dependable, efficient, and very quiet, so it won't bother the neighbors. It will not run the the air conditioner, but is great for the electronics, like television, and dvd players, and satellite. Microwave is a toss up, depending on how much other stuff you are running. The Yamaha 2400 is probably next, but same problem. It might run the Air Conditioner, but then nothing else. These are true sine wave generators which your electronics REQUIRES. Now you can buy two of the small Honda's, and a parallel cable, and tun the AC. Not sure on the Yamaha. All of this is pricey, a couple of thousand, and I know some one will start posting cheap deals, so I'll move on.
Next is the campground. Many only allow generator usage during certain times of the day, and almost never at night, so there goes the AC again, and now all the electronics.
Lastly is being a good neighbor. Most people will get their generator as far away from their site as possible which means it is in your bedroom window. How loud do you want it to be?
You can to the big box store and get a contractor generator for the AC, but the electronics may not work, and it will be loud. And if you keep your neighbors up at night with a generator running, they will be up early, banging pots, pans, tent pole, setting the alarm on their car, thus causing the horn to blow......... and the list goes on.
Search on here for generator, many post, some reviews by owners, and do some homework.
Figure out what you want to do, and post back, someone will help.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT