I am bummed you didnt get any responses as i am not looking at the same. Reese Goose Box with 4 inch offset ball in a 6'4 bed.
If you went to it, please let me know how it is going, and any other feedback would be appreciated.
I went ahead and made the conversion a couple months ago. I don't have any feed back on how it pulls. I'm out of town working, and haven't had to move it. i have hooked it up to my truck, and was really impressed with the clearance all the way around.