Buy a 3/4 ton, you will not regret it.
If you don't need one its a great way to spend more on registration, more on gas, and not really gain anything.
I drive an ecodiesel and do about what the OP does with it. I get 27 mpg commuting to work and over 30 on the hwy to/fro the ranch.
Pulled a 16' trailer with 2k lbs of feed and all the junk we take along for the trip, air compresors ice chests etc. and got 21 mpg. If you need a 3/4 ton sure get one, if not its just a waste unless you just want one that bad. Its not the fastest truck in the world but it pulls our 24 foot boat pretty easily and I wont hesitate to pull our 30' tt with it.