the companion vs base model has been mentioned here many times in the last few month...
basically the companion model LOSES the direct 12v charger
but that is mostly an UNneeded feature and far outweighed by the new built in 30amp plug.
u will need a specific ADAPTER to use that plug with an standard rv 30 amp cord...
so along with the paralleling cable (~35$) GET THE ADAPER, honda dealer sell these too.
the part # might be....L530P-RV30RGT and the plug/adapter is ~20$
i've got one companion and 1 base model now, and the need NOT to attach the clunky looking 'adapter' is really nice...
here's another happy owner...
IF you just want 1 genset buy the companion model first.
should u decide on 2 (now or later) the 2nd unit can be a standard/base eu2000i
one nifty feature is that IF someone wants to parallel 3 gensets this can be done now too.
but the plug OUTPUT will still be limited to it's spec/rating.
IF u are shopping online (rather than buying locally) there are many vendors closer to you than wash state.
with good prices and free shipping.
many threads on 'best price' for gensets, here's a recent one...
and don't 4get a nifty/sealed cargo box for these gizmos...