FYI, if it bothers you to frequent the gas station more often, then go with the long bed for the bigger tank. The 4.30's are fun but aren't the best for mpg's.

Any reason for going with the 10k package (insurance/registration?)? The gooseneck will probably dump you over your GVWR as these trucks are pretty heavy. I had mine weighed, came in just over 8000lbs. That was just me, a buddy (~185lbs) and a half a tank of gas. Doesn't leave much room for payload/trailer with the 10k GVWR package. Just throwin' it out there, something to think about.