First of all - I understand that it is your truck to do with as you like. However, the four-color camo scheme, known as the MERDC (Mobility Equipment Research and Development Center ) was originally intended to have covers PAINTED in camo to match the vehicles. But, a paint for the canvas was never developed, so, the army soldiered on with OD canvas for the duration of the four-color scheme's authorized use. From my research, the colored covers were not introduced to the supply system until after the three color NATO scheme was adopted.
Hope this is at least entertaining.
Regards,
David Doyle