This is all I know about them:
in late 1969, the last M715's to be produced in Toledo, Ohio, 43 of them in all, were ordered by the US Army as prototypes to compete for a normal mobility vehicle contract with the trucks pictured here. The normal mobility vehicle was to be used in rear areas while a different 1 1/4 ton for high mobility areas was to be used in forward areas. The M561 Gamma Goat was the vehicle selected for the high mobility contract. While these 43 M715's had a few minor improvements, they were essentially the same as the regular production M715's. Chevrolet was the manufacturer of these competitor designs. The cargo version was identified as XM705, the ambulance was labeled XM737. While few details about the powertrain are readily available, the following is known about the XM705/XM737:
Engine--V8-307 cubic inch--144 horsepower @ 4000 RPM (Note: One source lists 156 HP)
Transmission--4 speed
Transfer case--2 speed
Curb weight with winch--6929 lbs.
Length--204 inches
Width--84 inches
Height--104 inches--reducible to 73
Wheelbase--135 inches
Tires--9.00-20
Suspension--semi-elliptic leaf springs
Price--approx $5400
Note: The M715 price was about $1000 less per vehicle but the XM705 was considered, by those who tested it, to be a superior vehicle of high quality and perfomance.
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!