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Any late model 1/2 ton pickup, properly equipped, should handle your towing task well. I believe displacement is important for longevity when performing heavy duty tasks.

My personal preference is the Ram 1500 with the 5.7 Hemi engine and towing package. I have a 2014 and get right at 18 MPG overall mileage. Twenty MPG on the Interstate at 70 MPH is routine. I've never checked towing mileage specifically but suspect it is around 18 MPG. My tows are all on flat terrain with a lighter load than you anticipate (190 Montauk w/Verado). The truck is very comfortable with a nice ride which makes day to day driving very enjoyable. Care when towing is necessary because it is so easy to forget you have a load behind you. Drive one.

Due to the very high purchase and long term maintenance costs of diesels I can't recommend them any more except for extreme towing demands. I drove diesels exclusively for several years towing boats and heavy RVs but when the RVs went away gasoline power was on the horizon for me.