I'd like to make a late war diorama but don't want to make any historical mistake.
Amongst these trucks, which one were still on service by the end of the war, I mean in late 44, by the end.
Krupp L3H163 (ICM)
Henschel 33D1 (ICM)
Mercedes 4500S (Zvezda)
And light vehicules :
Opel Olympia 37 (Bronco)
Type 170V (Miniart)
I'd like to go over the classical Kubelwagen and Blitz
...you want to depict.
As a general rule there is nothing that is absolutly impossible. But if you want to depict a frontline unit in Russia, which has had several refits or even has only been created in 1943 the likeliness is somewhat different then for example you showing the retreat through Czech lands in 1945 where alot of 2nd line units with their older trucks and cars where involved.
In general you will find examples of all the vehicles you mentioned in late war footings, there obviously being the old runners that still soldiered on or had recently been scraped together from training units to bolster the ever dwindling resources of the units.
Likelyhood for trucks from my viewpoint is:
1. L4500 wood cabin (you can depict it both **** and as A version)
2. Ford V3000 and L4500 Metal cab
3. Krupp / Henschel
For the cars:
Reasoning being that the Opel is a prewar version while the Mercedes has been produced longer and the SdKfz 1 is more likely to have been in a front line use and therfor not survive that long.
Hope the ideas help somewhat...