You probably already figured this out, but a 2800 will give you 23 Amps, where two tethered 2,200's will give you 35 Amps. Just cannot run your AC and attempt to microwave something at the same time. How quiet are the Champion units? I don't remember if they are quiet or not. The noisy ones will get real old, real quick.
I used to have a Troy-Bilt 6200 generator, which weighed 250#! It was a struggle to get it into my truck, AND it was noisy. AND it was thirsty! I built a sound enclosure for it to use at a NASCAR event and it was still NOISY! Sold it and bought two of the Ryobi i2200 inverters which are within 1-2 db. of Hondas. You can stand right next to them and carry on a normal conversation. I carry both Ryobi i2200 units with a tether cable if I intend to camp not in a park; just can't use my second A/C. On longer road trips I carry just one unit with a 5 gallon gas can in case I have to camp in a road side park or Walmart for the night. One will run the 15KA/C unit for the night and power the TV/Satellite.
D_B Travelers - 30 nights in 2016... so far. 54 nights in 2015. 2014 Rockwood Windjammer 3001W Diamond Pkg, 2015 GMC 3500HD CC DRW Duramax, Equalizer 14K hitch, TST 507rv TPMS.
"Happiness? A good meal, a good cigar and a good woman - or a bad woman; it depends on how much happiness you can handle."
George Burns (1896 – 1996)