Pickup box D-pillar assembly

1. A pickup truck box assembly comprising:

a truck bed secured on a rear edge to a rear cross-member;

an inner side panel mounted to the truck bed; and a D-pillar including an inner part secured to the cross-member and inner side panel, and an outer part secured to the inner part and disposed between an outer side panel and the inner part,

wherein the D pillar inner part includes a U shaped portion and a first flange extending rearward substantially ninety degrees from the U shaped portion in a plane substantially parallel to the side panel and a second flange extending from the U shaped portion outboard of the inner side panel.

2. The assembly of claim 1 , wherein D-pillar inner part further includes a cutout sized to receive the rear cross-member.

3. The assembly of claim 2 , wherein the D-pillar inner part has a first thickness and a second thickness greater than the first thickness, and wherein the second thickness is located adjacent the cutout.

4. The assembly of claim 2 , wherein the rear cross-member further has a base flange extending from a lower portion, and wherein the cutout includes a notch sized to receive the base flange.

5. The assembly of claim 1 , wherein the D pillar inner part and the outer part are secured to one another such that a cavity is defined therebetween, and wherein the cavity is sized to receive one of tail lamp wiring, a portion of a stake pocket component, a strut damper, a tie-down attachment, and a bed extender attachment.

6. The assembly of claim 1 , wherein the first flange of the D-pillar inner part is oriented perpendicular relative to the rear cross-member.