He must be talking about a fast parade......
I drive 261 with a 1940 4 speed crash box.....hooked to a 2 speed transfer case....in 4th gear low range is about 20 mph with the engine screaming.
Never did figure out how slow it goes in first low range but I can walk out the truck..... walk around it and get in again no sweat........ amuses people at truck shows...
so I double clutch a lot and shift with my non - synchronized left hand........... the truck is RHD.....
........ahhhhh....... I don't use major highways......