I got the little new Powermate units; PM2200i. They are the Powermate version of the Generac units. Same design, literature, etc. 2200w surge; 1700 running watts. They are stupidly cheap right now at Rural King. $379 plus tax. I can buy TWO of them for less than one Honda or Yamaha, and still have plenty of money left for cigars and bourbon. Two of them will cost me $810; you cannot even get one of the new 2200w Honda or Yama's for less than $1000 right now. Admittedly, the PM brand may not last as long, but then I don't expect to ever wear it out because I don't boondock that often anyway. These came out as 2000w units in the Generac line about three years ago. They got bumped up to 2200w this year, and then Powermate (Coleman) picked them up.
The parallel wiring of any inverter generator is simple, you just connect the same wires unit to unit. Wire an outlet receptacle from each genny into a common outlet. (ground to ground, neutral to neutral, hot to hot). The inverter technology works between units so that they phase properly for the correct sine-wave. Most of them use the banana style plugs, so that there's no "hot" plug to hurt you should one come out of the unit. However, these are a pain because you have a separate ground to connect on both gennys. I prefer to rig up make plugs for the 5r-20 outlets. Yes; it could be dangerous should one come out and lay "live". OTOH, they will always have a positive ground as long as they are attached because the ground is integral to the plug and not separate.
Amazon has many choices in both styles. Here is but one of many examples of each:
shielded style
Amazon.com : WEN 56421 30-Amp 3600-Watt Parallel Connection Kit for Inverter Generators : Garden & Outdoor
www.amazon.com
prong style
Amazon.com : Westinghouse Inverter Generator Parallel Cord - Compatible with Westinghouse iGen1200, iGen2200, iGen2500, WH2200iXLT, and WH2400i (Generators NOT Included) : Patio, Lawn & Garden
www.amazon.com
Check out YT vids; plenty of info there on how to make your own parallel kit from simple supplies at any hardware store.
WARNING - this type of connection between generators is ONLY applicable to inverter type that have parallel circuit capability built into the control of the inverter. (most of the interver type do have this; but check to make sure). This is NOT, repeat NOT, true of the older style of square step wave brute force generators that simply run the wave regardless of what's going on around it. DO NOT try to tie any non-inverter generators into one supply; they are not going to phase properly and you can ruin your generators and anything plugged into them. This parallel-generator concept is only applicable to inverter generators that have parallel tech build into them.