Since nobody has yet replied I'll add something to get you perhaps a start. With current models Lance seems to have pretty good numbers, with the main variation being due to options. The only option you mention is the genny. So if I were trying to figure this out without anybody replying, I'd go to Arctic Foxes website where I have heard they have a good listing of each option and what it weighs....to figure out how much a generator generally weighs. You might also note a few of the other standard options like a microwave for reference as well. Then add those numbers to Lance's published value for the model you refer to and I'd expect you'll have a pretty good working number to start with.
Good luck I am sure sooner or later someone with that model will reply. You could also search on the Lance Owners of America pages.