Here are a couple of pics taken when my Dad was in Vietnam in '68-'69 that I thought may be of interest.
I believe this is an M37. My Dad was doing front brakes on it.... Gotta love the NDT's!
Here's a deuce and trailer:
Here is a shot of the front of the 5 ton wrecker he drove in Vietnam:
And here's a side view of the same wrecker:
There will be more and I am sure I have seen a 715 or 725 in one or two of his pics.