I'm a little concerned about putting a 015 1050s (ordering it today) on my old 99 Dodge 1-ton 4x4 dually! It hauls the old Lance 880 ok (I have added those bump stops to do the O/L springs & helped. I couldn't imagine putting the 1181 (which I prefer over the 1050) or an 1191 on my dually! but of course it has a lower GVW because of its age.
One good source for figuring added weight for options is from the Arctic Fox brochure or website. I found they pretty much list the individual wt for most everything. Lance is a pretty well equipped TC in its base model so maybe there isn't to much to add to there specs.
I,m sorry I don't know your situation, but after owning several new Ford f-250's in the 80's & 90's they all had poor brakes. I know things are better on the new one's, but I would definitely consider the F-350 just for the added margin the 1-ton has over the 3/4 ton. Just IMHO,
congrats on the new TC-Hope all works well.