Today, the Heavy Expanded Mobility Tactical Truck, or HEMTT, is one of the military's most important but unheralded vehicles. This eight-wheeled behemoth has been around since 1982, but its highly-capable predecessor saw action well before the HEMTT hit production lines.
That predecessor was the GOER family of vehicles. GOER is short for Go-ability with Overall Economy and Reliability. These four-wheeled vehicles had an articulating front section (which allowed it to make sharper turns) and amphibious capabilities (it used its wheels to propel through water), making it extremely versatile. These vehicles could operate in front-wheel drive while on the road, but could shift to four-wheel drive for the paths less traveled.
Two of the unique features of the M520 Goer are on display: Its amphibious capacilbity, and its articulated structure.
The GOER was first developed in the early 1960s and saw some field tests in Germany and Vietnam. Four versions of this vehicle emerged: The baseline M520, an eight-ton truck; the M533, a wrecker (really, a big tow truck); the M559, a fuel tanker; and the M877, an eight-ton truck with a crane.
After yielding outstanding test results in Vietnam in 1971, the Army placed a production order with Caterpillar to create 1,300 trucks — a mix of the four variants mentioned above. But its run would prove short. By 1976, a number of the vehicle's shortcomings came to light. One of the most notable was the lack of suspension, which made the ride very difficult. The GOER was also just too big, and there were safety issues with the way the front part of the trucks oscillated.
The GOER family of vehicles also included a wrecker.
To address these problems but maintain the capabilities of this versatile truck, the DOD sought a replacement. Thus, the HEMTT family of vehicles emerged. Most of the GOERs never saw the civilian market, but were instead scrapped.
See this vehicle be put through its paces in the video below!