I'm sorry I wasn't able to respond sooner. I have just returned from May Madness. Its not a good idea to have your pin sitting rear of the axle. My neighbor had to add air bags because the installer set the pin aft of the axle by about an inch. The ideal position is about an 1" to 1-1/2" forward of the axle, to shift some of the weight to the front axle, for better stability. He even had a long bed, so I don't know why they set it aft. It also helps in keeping the truck as level as possible, so the front doesn't have the "sit in the air look".
Steve...