Mk I:

Marmon-Herrington started a design in the early 1930s for export. In 1939 the Union of South Africa and the US National Guard purchased some models.   It was basically a kit to convert commercial trucks. The fully built versions entered service with South Africa in 1940. None of these were issued to British forces.

Mk II:

With the British King's Dragoon Guards at Tobruk in 1941.

This had 4 wheel drive with a longer wheelbase. Early models were riveted with the rest welded. These were used against the Italians in East Africa. These were requested by the British War Office and were used in the Western Dessert from 1941 to the end of the Tunisian campaign.
Some had field modifications of taking the turrets off and more powerful guns mounted behind gun shields. Guns that were used were Italian 20 mm and 47 mm Breda, German 37 mm and 28/20 mm taper bore, and French 25 mm.
Other variants were artillery OP, ambulance, command car, fitters vehicle, and RAF contact car with AA Lewis gun in turret and radio antennae.

Mk III:

The demand for armored cars increased and the lessons in combat led to improvements being made. It had a shorter wheelbase, single rear door, no radiator grill and no headlight covers. Some of the models were field modified as the Mk II was.

Mk IIIA:

Turret removed and 2 .303 Vickers AA fitted on a ring mount protected by a steel skirt.

Mk IV:

Completely redesigned using Ford and Marmon-Herrington components on a 4x4 chassis. The suspension, engine, and transmission were bolted onto the hull. Some had runflat tires installed.

Mk IVF:

Had rear engine facing forward with gearbox and radiator mounted at the rear.

MK VI:

8 Wheels.

	Marmon-Herrington Mk I	Marmon-Herrington Mk II	Marmon-Herrington Mk III	Marmon-Herrington Mk IV	Marmon-Herrington MK VI
Crew	4	42	31	31	31
Physical Characteristics
Weight		13,440 lb 5.4 tons3, 6 tons2	11,760 lb, 13,440 lb1 6,096 kg1 5.4 tons3	14,336 lb, 14,787 lb1 6,707 kg1	24,658 lb1 11,185 kg1
Length w/gun		5.21 m3	17' 5"1 5.3 m3, 5.308 m1	15', 18' 1"1 5.511 m1	18' 8"1 5.69 m1
Length w/o gun
Height		2.44 m3	8' 2"1 2.489 m1, 2.49 m3	7', 7' 6"1 2.286 m1	8' 1"1 2.45 m1
Width		1.98 m3	7' 6"1 2.286 m1, 2.29 m3	6', 7'1 2.133 m1	8' 8"1 2.64 m1
Ground clearance
Ground contact length
Ground pressure
Turret ring diameter
Armament
Main	.303" Vickers	.303" Vickers, Boys ATR	2: 7.6 mm (.303 cal) MG1 .303" Vickers, Boys ATR	2 pdr (40 mm)1 QFSA	57 mm (6 pdr)1
Secondary
MG	.303" Vickers	.303" Vickers	.303" Vickers	7.62 MG1 7.62 mm Browning MG	7.62 mm MG Coaxial1 12.7 mm MG1
Side arms
Quantity
Main
Secondary
MG
Side arms
Armor Thickness (mm)		123	121,3	201	401
Hull Front, Upper	12	12
Hull Front, Lower
Hull Sides, Upper
Hull Sides, Lower
Hull Rear
Hull Top
Hull Bottom	6
Turret Front
Turret Sides
Turret Rear
Turret Top
Engine (Make / Model)		Ford2	Ford1	Ford1	2: Ford1
Cylinders		V-82	V-81	V-81	V-81
Net HP		853	851,3	951	951
Transmission
Fuel type		Gasoline2	Gasoline1	Gasoline1	Gasoline1
Octane
Capacity
Performance
Traverse
Max Speed		50 mph 80.5 kph2, 83 kph3	50 mph1 80 kph1, 83 kph3	50 mph1 80.47 kph1	40.38 mph1 65 kph1
Cross Country
Road radius		200 miles2 322 km2	200 miles1 322 km1	200 miles1 322 km1	249 miles1 400 km1
Turning Radius
Elevation Limits
Fording depth
Trench crossing
Vertical Obstacle
Suspension (Type)
Wheels each side
Return rollers each side
Track length
Tires	4	4	4	4
Track width
Track centers/tread
Production	100		1941- : 2,6001	1943- : 2,000 2,1001

Sources:

1. The Encyclopedia of Tanks and Armored Fighting Vehicles - The Comprehensive Guide to Over 900 Armored Fighting Vehicles From 1915 to the Present Day, General Editor: Christopher F. Foss, 2002
2. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
3. Jane's World War II Tanks and Fighting Vehicles The Complete Guide, Leland Ness, 2002

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