To me it is logical to NOT buy the companion first. Why spend the extra money for it if it turns out you don't need the second one. You only need companion if you have 2 generators in parallel. Buy it last, if you need it.
2018 F250 Lariat 6.2 4X4 w 4.30s, 2018 Wildcat 29RLX
2012 BMW G650GS, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs