IMHO, I would suggest you also add the cargo capacity of the truck to your data. That is the key to the difference between 3/4 tons/one ton srw trucks and duallys. A diesel of any size can tow any Montana, the problem with the 3/4 ton/one ton srw is the ability to handle all the weight in the truck.
On edit, if you are looking at a newer truck (04/05 on) the cargo capacity can be found on the Tire and Loading Sticker. The sticker is on the left rear door post.
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