Taku, we're in a similar situation so I'll offer few of my thoughts.
Like others we've looked hard at the Alaskan and come away impressed. The big takeaway was the famously comfortable dinette seating and the large windows that are at just the right height for us. We don't have a dinette in our FWC but having limited vacation time to camp we don't really miss it. But in future, with more time available, we'd want a comfortable place to lounge - and the AK fits the bill beautifully in this regard.
Also with longer trip time, we'd like to stop and smell the roses more. So more stationary camping with activities. That means a way of carrying things like a BBQ, bike, boat or what have you. Storage is always important but the point here is looking ahead to what you will want to carry, or not, in future and how your camper might fit it all. AK does have an advantage with it's power roof lift allowing storage up top, if you can get to it conveniently.
One thing missing tho is a shower. If renovating or refreshing an older AK unit for longer term use I'd think about incorporating a shower.
Your right, weight is a big thing. One reason we've kept our Granby so long is that most any other camper will be heavier and we are already heavier than most on this forum. What's important though, is how the truck handles the weight and at what speed. A heavier camper would slow us down, esp off highway on FSRs. This is not desirable for us on our on limited vacation time but would be much less an issue with "more time" .
btw Bryan offered the rule of thumb of 19-20lbs per inch, wet. If you are thinking used, would you be looking for an 8' ? Are you considering putting this on your current vehicle ?