Re: Tow Vehicle Question - F250
I'd go find an F250 with a Powerstroke. The old 7.3 version is a brute and will never know that boat is behind it. Be careful of some of the older auto trannies, though - there is a known problem with them in terms of heat. There are cooling fins in the torque converter that tend to warp and separate. The fix for this is easy (welding), but expensive.
I pulled a 35 foot gooseneck behind a '96 F250/7.3 for about 6 years. The trailer (dual axle, single tire) was rated for 14,000# gross and I loaded it that way often. The last I heard, the truck is still going with close to 300,000 miles on it. The tranny was rebuilt, due to the above problem, at about 180,000.
On the day that the tranny blew up, one of "the guys" had the trailer grossly overloaded and was driving up a ramp at the Superdome. The Powerstroke could have cared less about the weight and pretty much "ripped the transmission apart."
As for mileage, I can't really offer a loaded comparison, because we ran the truck at much higher weights than you would. If we got 10mpg on the highway, we were happy. That said, I find the previous suggestion that a 250 with a 7.3 litre powerstroke will get 19 mpg on the highway, even when unloaded, to be very optimistic. About 15 mpg is much closer to what most people could expect to get.
BTW, don't forget that there is such a thing as a single rear tire F350. The allowable combined gross weight rating isn't much different than the dually. What
is different is the allowable "tongue weight."
Now, if you really want a truck that could care less about an 8,000# boat, get an F550!
