If you are living in it then I suggest a crew cab, not a king cab, you will be glad for the extra storage room.
Have you looked at the Nissan Frontier? Similar truck, more reliable. MPG will be bad when towing, 10-12mpg I bet.
What is your budget?
Consider a full size truck like F150 with a 3.7 motor, 2011 or newer if budget allows. More power, more torque and mpg will not suffer as much as with the little truck with old technology engine.
That F150 will get 23mpg hwy, and towing it will do better than the mid-sized trucks.
If you are mostly towing then the bigger truck will give you better mpg as the motor will work less, even if you have to look at older trucks in v8 configuration that are not great mpg, but when towing things look a lot different for mpg numbers.
Research this on the truck forums for more info rather than a trailer forum.
If you drive a lot then a diesel might, might be worth it. mpg will stay high, but fuel cost are also high and oil changes cost more since you use gallons not quarts. Unless you find a small diesel like in a Sprinter (which Im sure is out of the budget), those will not be locomotives like the 3/4 ton truck diesels.
For aerodynamics, bolt that cone to the rear, this is where the drag is, as stated, not the front. All the old 1950's trailers were aero and sloped/shaped at the rear, not the front. A slanted front does nothing.
On one of mine I mounted the solar panel to hang off the rear to mimmic the big rig trailers with their wing things over-hang cavity shape. This helped the air flow a little smoother. The big rigs would not bother if it did not work. You can bolt on something that will look trashy, but solar panels will not look like a garage-fix home-engineer hack. Solar panels have a purpose and where you attach them is OK, IMO.
