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Welcome to the forum and congratulations on that rig!
If you adding more stuff especially the generator, then you might consider the dually. I don't know the ratings for the new 2011s but that pin weight of that large Monty will certainly tax the rear axle. There is no way to improve the RAWR on a SRW F-350, and I wouldn't even bother with the F-250.
I also think the F-350 dually is the best bet since you can get a lower diff that can probably tow the weight and keep the mpgs down when not towing. I think the F-450 dually (only comes in dually) has a higher diff and while it's far stronger you'll get less mpgs. Again check the number and then weigh the actual weight.
If you eventually add the washer/dryer and 2nd A/C these will add weight to the rig and pin too. As the saying goes, just cuz there's plenty of room in the rig, doesn't mean you can carry the weight.
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