Unit Rig

Guier eventually took control of Unit Rig and in 1951 sold it to Kenneth W. Davis, who already had several oil-field related businesses under the parent company name of Kendavis Industries International.

R. G. LeTourneau had already adapted compact electric drive wheels to construction machinery with great success, prompting Unit Rig to investigate the possibility of building a truck and finding a suitable client to take the finished machine.

By 1960, the M-64 prototype truck was completed using General Electric drive systems and featuring special Goodyear low-pressure tires for the suspension.

The trucks required large quantities of steel, the majority of which was purchased from Canadian companies, and shipped to the Tulsa plant for fabrication and machining.

In early 90s, Unit Rig brought in the first truck that had design intent for a min 8000 hours operation per year and successfully proved it.

Both trucks wrote new chapters in TCO - Total Cost of Ownership which is an indicator of life time expenses made by a client on parts, fuel and Capex.

Lectra Haul (M200) giant mining truck in Asbestos, Quebec
This Unit Rig BD30HD haul truck was assembled at Jacobs Ranch Mine and operated for 20,000 hours hauling 10 million tons of coal. It is now on display at the outdoor Energy Equipment Exhibit museum in Gillette, Wyoming .
Unit Rig Lectra haul truck 143 is on display at the Wright Centennial Museum in Wright, Wyoming . Its gross empty weight is 223,276 lbs and it houses a 16V149 Detroit 1600 HP engine while using 20 gallons of fuel an hour.