Those are our now replaced Canadian 1976 Chevrolet 5/4 Ton pickup trucks. They reinforced the frame of the CK200 by incorporating some technology of the CK300 frame according to GM so the vehicle would have the 1-1/4 Ton rating. Basicly GM's first standard commercial regular production pickup consisting of RPO's and accesories designed for a military application. Full time 4x4 NP203 Transfer Case, TH350 Transmission, 350c.i.d. motor, Dana 44 Front axle and 14 Bolt/Posi-Trac Corporate rear with 4.56 gears. 24Volt system piggybacked onto the 12Volt factory harness for powering the military equipment. Gas Southwind 978 rear heaters in troop cargo seat area and for the van body ambulance, radio truck variants. 2848 purchased aside from the original handful of test trucks. Wheel winch adapters, arctic assist start kit, front mounted electric winch and front mounted pintle hook were a few of the ancillary equipment. Four tie downs were added to the strengthened frame rails for rail shipment. These pics came from one on e-bay not to long ago. As you see it was what it would have looked like at the end of there long service life, minus the British Columbia plate. The black and white shots are from in-service period. I've always had a soft spot for them, and wanted this one but it went to a guy in Washington state. Really an early gas powered CUCV. Cheers.