The pictures  (starting at the top )  this is the 8 ft grill  it has 6 trays in it (option 4 or 6 tray )the fire box is on the back side of this grill ( on all grills )  . this grill is 45.5 inches in diameter and  96 inches long , and the fire box is 96 inches long and open the full 96 inches .                                                                                
The next picture is the 6 ft grill , it has 6 trays in it ( option 4 or 6 trays )this grill is 38 inches in diameter and 72 inches long . the fire box is 72 inches long and open the full 72 inches                                                        

The other picture is the 4 ft grill , it has 4 trays only . It is 30 inches in diameter and 48 inches long and the fire box is 48 inches long and is open the full 48 inches . Each grills fire box is at least .250 (quarter inch ) thick, the 6 ft and the 8 ft come with 15 inch tires and the 4 ft comes with 12 inch tires ( they're all new tires and wheels )  Our 5 ft grill has 12 tires also and it will cook as much as one and half 4 ft grills