You don't want the upfitter package. On the Dodge, they do offer Auxiliary Switches which will give you 3(?) switches on the dash and connection points under the hood.
With the diesel, you should be able to come close to that setup and save at least $4k just from the rebate. I've been looking hard but my problem is I want the 6.4 Hemi so will either settle for a white Tradesman or spend the money for the 2015.
If you are ordering dual alternators, I don't think you need to order the snow prep package. It just gives an alternator upgrade and transfer case skid plate. The snow prep package will also give you a notice that says the truck is not recommended for carrying a camper, though doesn't mean much.
Have no idea why you would want 19.5s on a Dually since the 17" skinnys will easily max out the axle capacity.
Did the dealer give you an estimate time for delivery?