One reason we bought the GD was because of its larger tanks.
Does the 2670 have a gravity fill port on the fresh water tank? Our 2650 does but the earlier models didn't.
I believe the 2670 has the fridge vent on the roof and no fans, a plus over our 2650.
The Furrion solar port is a useless feature IMHO. I'm planning on adding solar but will tie the charge controller right to the batteries.
And you need to add the usual upgrades - dual batteries, and an upgraded converter for charging off a generator. My IOTA converter is in the pass-through next to the hookup center.