Dodge D-15 and D-60 info

[Erwin]

My D-15 has the following data-plate:
1stplate:
Dodge D 1542?C
Cab Mod 21
No. 910 48 555
T222 20 75 60
Date of manufacture: 2.10.43
2nd plate
Maintenance Manual: C 428D2
Spare Parts: 3833

Paint beneath the civil postwar green is first yellow, then olive green.
Is there any chance to trace the mission areas of the vehicle?
And: the cab roof shows a welding to close a previously open hatch.
Which version had this hatch?
And: in this thread some b/w pictures of camouflage-patterned D15s have been posted, obiously sand/black. (e.g. the Military Police D15 in the British Pathe movie)
My last question: What colors are these exactly?
Thank you,
Erwin