The added distance the pin adapter adds doesn't affect the effective center of gravity for the pin weight. It's just the ball position, which with a ball mount Andersen in my Ram resulted in the weight being carried approximately 4 inches behind the axle. When I had an Andersen I can't say I noticed any handling issues at all, and the actual weight balance on your truck axles on changes a few pounds, far less than you would think.
I when I got rid of the Andersen and bought a B&W hitch I ended up adjusting it so the weight is being carried aft of the axle as well and it too handles well, wind, winding roads, icy roads, doesn't matter tracks reliably, predictably, issue free.
