Those last two in the first post are 5-tons -
The middle pic is some flavor of M54 identified by the air cleaner on the fender.
The last pic is another M54 identified by the 10-lug wheels.
I've heard that deuces and lighter didn't make the best gun trucks since their capacity for weapons and armor was less, especially considering their size.
That said I've always thought the coolest gun trucks were the ones with APC hulls in the cargo bed