which inverter and why? 3000 watt pure sine wave

3000w I would be at 24v and probably a Victron Multiplus. Especially to tie in with a smallish generator.

I almost bought one back in 2006 but opted for Prosine 1800. Still works fine and does all I need. Now with solar I have skipped on any need for a generator.

If cash wasn't a problem, I'd go for the Magnum Energy hybrid PSW inverters. That way, you can run your A/C, and the initial locked rotor amps that would overload a 3000 watt Yammy will be shared by the generator and the battery bank.

Do you plan to use the inverter to power your whole rig?

My Samlex is a good heavy unit and working well. I would definitely want a hard-wire option in getting one that big. And I personally would never buy the cheapest.