Judging by the photographs that I have of this trailer type, the M101CDN2 was originally delivered in the NATO three-colour camouflage as seen in this image taken at CFB Kingston in 1994.
I am not sure when they were repainted to only Canadian green, but I also have images of these trailers in use in Bosnia in 2001 still sporting the NATO camouflage.
I have imagery from 2002 that shows these trailers now painted green only.
I cannot say if they were ever painted white for a UN mission and would be interested to see an image of one so painted. I believe though that, the M101CDN2 Iltis trailers were not painted in the Canadian three-colour camouflage although once again if someone can come up with an image that shows one in CF use so painted, I would be pleased to see it.