Go with the Reese Titan. It carries a 12,000lbs dead weight capacity and a 1,200 lbs tongue load. Very cheap insurance. And as has been said they use the V-5 rating regiment.
As far as hitch pins go, they are in double shear. So unless you use a brittle material, the pin will not be a problem. Anybody care to draw an FBD to describe the joint......anybody.....Buehler
Also, with the advent of the electric over hydraulic brake systems, load distributing hitches are more easily applied to boat trailer applications. Surge brakes were the problem. The elec. over hyd. provide the best of both worlds. They even work correctly in reverse