Most of the photo’s and film footage we know of the ambulance shows them with the canvas top mounted. While standard jeeps were usually stripped naked by the marines, the canvas top was nearly always used.
The reason is simple: in the hot climate of the pacific the top offered necessary protection from sun and dust on Saipan and Iwo Jima, while on Cape Gloucester and Okinawa the wounded were protected from the heavy rain.
Since it was impossible to find an original canvas top we had to recreate it from the old photo’s. After some study it became clear to us the different types of ambulance jeeps (early low version and late high version). There were a few differences besides the measurements.
One of the "improvements" was the introduction of a little window on the front right side. This clear cellulose acetate window was positioned right below the top litter shelf. Since this is lower than the drivers head, it is not realy of any practical use. The driver has to bend over and look under the litter shelf past a wounded man on a litter placed on the lower shelf to see anything but a blurry view of the surroundings!
The front of the canvas top hook onto the studs on the windshield just like a regular canvas top would. On the back side the top was made more simple by eliminating the back flap. (The original Holden version had a curtain that covers the left side of the back.)
Also the introduction of straps on the top created the possibility to roll it up. Because of this demand the front of the top is separated from the sides. Along the edges of the top are five buckles, three on the right side and two on the left side. Inside of the structure were five straps attached to the frame. With the sides roled up these straps secured the rolled canvas with the buckles. (This feature does not appear on all the high structure models.)
On the roof a wooden beam was added to give the top more sturdiness and prevent flapping of the canvas while driving.
Later in the war or during the Korean campaign more adjustments were made. One example is the fact that wartime tops had canvas straps to fasten them to the body while the Korean version shows that the tops are fastened with ropes. Instead of sewing a strap to the canvas top a grommet was placed in the canvas through which a short piece of rope was passed to secure the top to the body. Also other versions how to roll up the top were introduced.