OK, once again, here's the weight for a cruising C-Dory 25, Journey On. I haven't seen anything to make me change my mind or the weights.
Note that the weight of the boat and trailer was weighed at
8000#, with no gas, no water, no kicker. This means there was about 500# in the back of the truck.
On the water, the weight is
7400#, which is beyond reason, but works well. You can adjust either weight for your particular conditions.
Kicker is 130# (with gas tank,) water is 200# for a full tank (25 gal,) and gas is 300# for 1/2 tank (50 gal.) Trailer is galvanized steel. Tongue weight is somewhere around 500#, which tows well.
ANY big V-8 can tow the C-25. You just have to shift down on hills. With a 1/2 ton, I used a weight equalizing hitch. With a 3/4 ton, I can't use such a hitch, because the rear end needs weight for traction.
I run gas, diesels are up to you.
Boris