After further review the ruling on the field has been overturned. You are correct vor, It is a International M-5-6 not a GMC CCKW International M-5-6 and M-5H-6 Trucks in WWII - Military Trader/Vehicles Engines of the Red Army in WW2 (o5m6.de) Thanks for the great catch.
Like from this one in France European GMC CCKW Photo Blog: CCKW 352 - 649LT71 - Converted - Tow Truck (cckweuropephotoblog.blogspot.com)
I'm not normally an ice cream truck fan, though I'm aware there's an entire contingent of guys that collect those things. However, I agree, that one is strange, which is cool. I dig it too...