Vehicle markings

[Maurice Donckers]

My question is about markings on a 15CWT radio truck wich would be with the 25 pr guns , usually there is a Carrier or Op tank at the front , wich will direct the fire by sending messages to this 15CWt truck near the guns, who will then tell the gun crews were to aim at . would this truck have the colours from the signals( white blue), or the same as RA (blue red) ?
or better are there any pictures of these vehicles around ?