The most I’ve ever done on the Char-Griller is 4 large chickens; sorry I didn’t take any pictures. You shouldn’t have any problems fitting 8 medium chickens on there. Grand is right, you will have to remove the warming rack. And depending on how large the chickens are, you may have to us a smaller grate in place of the originals. This way you’ll get more clearance between the chickens and the lead.
Here are some pix from my collection that may give you some ideas on the grill's capacity:
A little afternoon snack