That's an ordinary 1/2 ton wheel but I'm not sure what it was used for. Maybe coiling hose around? The writing on the side of the tank says Premiere Gasolines. Like Bob says those railings are pretty fancy for the army. The caps on the railing corners are the shape of trailer balls but made for the job. 
A friend in town has a small museum with a B A bulk station and a 1942 GMC 1 1/2 ton delivery truck with no tank so I'll let him go get it.The tank is the perfect length for it.
		 
		
		
		
		
		
		
			
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				1940 Cab 11 C8 Wireless with 1A2 box & 11 set 
1940 Cab 11 C8 cab and chassis 
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun 
1940 Cab 11 F15A w/ Chev rear ends 
1941 Cab 12 F15A 
1942-44 Cab 13 F15A  x 5 
1942 cab 13 F15A with 2B1 box 
1943 cab 13 F15A with 2H1 box 
1943 Cab 13 C8A HUP 
1944 Cab 13 C15A with 2C1 box 
1943 Cletrac M2 High Speed Tractor 
MkII Bren gun carrier chassis x 2
			 
		
		
		
		
		
	
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