Two Soviet MiG-29 aircraft en route to an air show in Canada are intercepted by F-15 Eagles of the 21st Tactical Fighter Wing out of Elmendorf AFB, AK. The MiG-29s were, for the first time, traveling to the 1989 Abbotsford, BC Canada International Airshow
Grave Digger 1 after they put the Super Terras on it. At this point Grave Digger 2 was probably in service as well but it was a 1950 Chevy Panel Wagon whereas Grave Digger 1 was a 1951 Ford. Grave Digger 3 and beyond were all Chevy Panel Wagons but they moved from the old body on frame with leaf spring configuration to four link suspensions (and tube chassis and whatnot as the technology progressed).
edit: correction, not everything from 3 on was four linked and tube chassis. Some of the licensed vehicles not driven by Dennis were leaf spring and frame (I think 4, 6, and 8 were all licensed trucks, 7 was driven by Dennis).
I don't know what this is exactly, looks like someone cloned Bigfoot 1 as their own ride. Late 70s (can't see the headlights to tell exactly what year) Ford long bed, body on frame, leaf spring suspension. Either deuce and a half or five ton running gear (given that it looks like the guy cloned Bigfoot I'd guess five ton but I can't see the diffs). The pic beneath it is Bigfoot 1.