Blain's Farm & Fleet has sales periodically. I bought my two Champion 73536i 2000W for $491.67 each with shipping. Found a parallel kit on eBay for $50 shipped. Running parallel, ran my 13000 BTU AC in 90 degree weather, no problem. Nice thing about having two is I can easily handle the weight of each and if one ever craps out, I have another one that will run the whole trailer less AC.
2015 Forest River Wildcat Maxx 28RKX
2015 Ram 2500 Laramie Longhorn Limited 6.7 Diesel