I have a go power 2000 pure sine wave, like the OP was asking about. Picked this brand because it was a local BC co and they had a good reputation. Since then I have seen go power products now installed as oem by some camper builders, fwiw.
For sizing I wanted to replicate the capacity of a std home 15amp receptacle. At first I bought their ~1750 or 1800w model (long discontinued) but immediately returned and upgraded it when I saw the hook up terminals on the 2000 - much more HD imo, plus the overall architecture (?) is shared with the higher output 3000. Plenty of contact surface for power cables, good sized fans, ventilation etc. Plus output can be hardwired to a distribution panel, which is what I did after adding a second 120v circuit to the camper. That said, the GP tech told me the original, smaller unit would have done all that I could have asked of it. And I expect all GP products meet CSA specs/approval, perform to mfr ratings etc, etc.
OK, I'm the first to admit this thing is bigger and heavier than required but I had a dream about repurposing it in an off grid cabin some day ... and I did use it once to cool both the home fridge and deep freezer during a short power outage - had to save the steelhead don't cha know.
True, house batteries will drain quickly at "high" wattage. I wired so that I could also run the inverter off of the truck alternators and I ran a 120v plug into the cab - just like a modern vehicle.
But the sweetest part is the mounting location, too late for the OP, but it fit perfectly behind the lower cabinet slider.
