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It is an extra "cool" option that they can get a bunch of money for.. I have had a couple of Dodges, one with a 30 gallon tank and another with a 42 gallon tank, both look VERY similar from below, the tanks are very close in size.
The main reason is that larger trucks - many 350's and other makes of 1 ton trucks, have dual tanks so that you don't have to stop when hauling trailers on long trips. Heck we used to have a silverado dually with two 40 gallon tanks in the truck and a 100 gallon added to the bed. This allowed us to tow the horse trailer a long ways without stopping for gas..
I had a F150 with the dual 17.5 gallon tanks, always thought is was silly.
just my 2 cents worth
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