School me on late model trucks

[sqrlnts]

When it comes to the old trucks I am heavily biased toward Chevy/GMC trucks. BUT

I need to start doing some research on newer 3/4 ton trucks. Reason is my wife and myself will be getting a slide in truck camper and hopefully a boat in the near future. We first need to get something to tow it with.

To be honest I don't really care if its Ford, Dodge, or Chevy. What it must be is tough as nails. Here is what I am after.
1. Best fuel mileage available when towing
2. Don't want a diesel.
3. Must be under $14K
4. 4x4 is not necessary
5. Have the GVWR to carry a slide in camper and a boat or trailer and quads.

I know this is a Chevy forum but I would like to open up the discussion for all makes and models. I have never owned a new truck before so I don't have any experience to guide me.