I suspect it’s one of those things where if you know your way around (American?) military trucks you’ll recognise it instantly by things like the way the wing curves, but my immediately available knowledge only goes that far for AFVs The Observer’s Fighting Vehicle Directory World War II didn’t help, so I’m basically stuck.
So I did see the colour right — I thought it was US Navy grey, but at the same time, wasn’t actually 100% sure it wasn’t OD that looked grey in the photo because of the lighting and/or my screen. As for “These should do it” — if you’d posted a photo of a tank, sure Bloody Google is no help at all — every American WW2 truck on the WWW is a GMC or Dodge Beep, it seems.
Well done Jon. I thought that would do it. Hopefully you have all learned as much about American trucks as I did about American Patrol Boat's last night