On the GMC truck site there is a similar discussion and the consensus is offset as described here and angled to the right for some reason. Not parallel to the grill but angled to the right say 15 degrees give or take.

Last edited by Twin Jimmys; 05/01/2021 1:15 AM.
1947.2 GMC 1/2T SWB panel
1947.2 GMC 1/2T long bed
1948 GMC 1/2T short bed