Hmmm..... I see what you are saying. This weekend I will be doing a mock up of the bed box on the frame. I will look at it and see if there is any way I can discretely connect the rear sill to the frame rails.

I really like the way it looks without the stake pockets, but if all else fails I will put some new stake pockets from LMC back on.

I will check back in on Monday and let you know if I had any luck stabilizing the back of the bed.

Thanks again for the response.