hi John, it used to be a wireless truck and fond some information that it might be a light warning truck (radar installation). 
I will need to dig a bit deeper to find the right answer! 
chassis number is 2202 c4 /wt3357. 
 
Will be a good company for my Bedford QL and Triumph 3hw.
		 
		
		
		
			
		
		
		
		
		
		
		
		
	
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