Can't help with the haggling, but what 'canned o minimum' said for weight is about right on.
Mine is a 2007 4 wide
platform. The platform and related frame might contribute to some disparity in listed weights. It's also a 'Deluxe', although I don't know the implications of that. It was bare-bones -- 3 lights requiring 'AA' batteries, etc. -- until I began tweaking it.
I think one of the models you mentioned is the shell or
totally un-appointed one? If so, that was introduced later, and I'm sure removing the galley <sigh>, cabinets, carpeting, and whatever else could bring the weight down. Mine also came with a spare wheel/tire, and mount (seen in background here), so don't know whether that is added to the weight sticker as shipped, or whether the 'core' is 760 lbs before options are added on.
While this hasn't been mentioned, I keep thinking about your proposed trip. I don't know about the Alcan and other areas you may go, but in addition to other decisions, I think I would consider frame strength and integrity, and the type of suspension. I suppose you'd like bring the same trailer back as the one you left with. In terms of the frame, wheel and tire size, I think the Little Guy probably over-qualifies. However, while the torsion axle is touted as being a good thing, it (they - regardless of manufacturer) also tend to be bouncy.
I'm only mentioning this for your consideration. Depending on how it's packed, it might be a non-issue.
Oh, almost forgot ...
