CJW8 wrote:
I don't know about other makes but with the Blue Oval models there is very little difference between 250 and a 350. For years (up through 2013 at least)the only difference was the emblem and a 2" block in the rear springs. Tow rating was the same and sometimes higher with the 250. In this brand you can add 2000-4000 lbs. for the diesel engine depending on axel ratio.
That is true with SRW; but DRW definitely ups the capacity. For towing a big FW, I really like the stability of a dually, especially in the wet and high winds.