Not that I am a Champion fan but these appear to meet your generator specs, assuming you can cancel your current order with Northerntool?
Champion EGD-100573-KIT 100573 - 2 3500 Watt DH Open-Frame Electric Start Inverter Generator Package w/ Parallel Cable Kit & Wireless Remote CARBBuy Champion EGD-100573-KIT Direct. Free Shipping. Check the Champion 100573 - (2) 3500 Watt DH Open-Frame Electric Start Inverter Generator Package w/ Parallel Cable Kit & Wireless Remote (CARB) ratings before checking out.www.electricgeneratorsdirect.com
WOW - I got excited until I saw your linked genset is only 120v....
I've been waiting for Champion to have a quite inverter type genset that's 120/240, that's Parallel capable.
I'm looking for 120/240 is so I can connect to my main panel with interlock, feeding my subpanel at same time.
Ranked Inverter genset options I'm considering are:
1) The Northern Tool 3700/4500 Powerhorse open frame, parallel yields ~ 9kw, cheap (but backordered since Feb!)
2) Duromax XP9000ih (out of stock until.... fall?), strong single solution, but big n heavy
Comprehensive spec review of the DuroMax XP9000iH ✓Remote start ✓7600 running watts ✓9000 peak watts ✓Powerful ✓Hybrid ✓Long runtime ✓More quiet and better priced than others? Come find out...
3) Northern Tool Powerhorse 7500. A Honda clone, but not as strong as doubling above options #1 & #2, but could be doubled for $$$$.
4) Champion 100520 - I think their largest inverter genset, loudest one, no parallel. But, IN STOCK
Comprehensive spec review of the Champion 100520 ✓Electric start ✓7000 running watts ✓8750 peak watts ✓Powerful ✓On wheels ✓More quiet and better priced than others? Come find out...
Yes, I think good gensets are in shortage, along with whole house backups where Generac quote backlog is over 2 months long!
Thanks for the suggestions @jbird526