Ratio of canvas-top to open-top trucks.

[kato13]

I recently bought a ton of GHQ 1:285 Scale M1078 2.5 ton trucks


(not my image)

As part of my decades long goal to have a visual representation of the 5th Mech at Kalisz, I am going to convert a portion of the canvas top ones into flatbed open top. In an active field army like the 5th what do you think the ratios of canvas top to open top would be.

Looking at Pics from Iraq it seems to be about 50/50 (With many of the canvas top ones being in convoys) but I think in Poland (with more days of inclement weather) the canvas percentage might be higher.

Thoughts?