I would like to suggest this Bergepanzer III armed with a 15mm Mg 151/15,
That was used as a mobile infatry suppor / mobile MG/Cannon Nest, beeing armed.
Its history is unknown, except that it was used in the Defence of Berling (as the pictures show) and its a simple Bergepanzer III (Recovery version of Pz III with removed Turret, instead wooden or Metal cover, with a wooden superstructure) and in this case a Mg 151/15 with unique gushield in the front hull.
It could be placed in game at the Rank I and offer suppressing fire with its 15mm H-Pzgr with decent penetration for its size, while itself having 50mm of frontal base armor with additional Ostketten and another 50mm Gunshield which also partly covers the frontal armor. And would offer a neat Event vehicle. Or with Standart AP-T or AP-I ammo still enove penetration against the Rank I light tanks.
Bergepanzer III were build from refurbished Pz IIIs, as hulls of them came free after the normal Pz III Production was also halted, as for every combat vehicle adequat recovery vehicles were needed, however the main recovery vehicles were different Halftracks from Sd.Kfz.6 to 9, while these were usable, they were completly unarmored, resulting in casulties if they had to recover vehicles on the battlefield, as they were easy targets for artillery. Further problems were, that with tanks becoming heavyer and heavyer 2 or more (6 for Tiger I) Halftracks (Sd.Kfz.9) were needed to pull these, as such Tanks with itself strong engines and some armor as well as firepower to defend themself were appreciated. These were simple Pz III (some few IV) hulls where the turret was removed and a wooden superstructure was placed atop, with tools, spare parts and cables as well as wooden logs to make makeshift roads.
Pictures:(Click to show)
The Gun:
15 mm Mg 151/15 (appears to be a free aiming field made mount) 700 rpm, 250-500 round boxes (unknown storage)
The Vehicle:
Bergepanzer III
Simply a late Pz III Chassis, removed turret with a new additional superstructure made from wood, with spare parts and such, with Metal or wooden covering. Here with additional 50mm Frontal shield and Ostketten equipped and put on the front for additional armor.
Engine: HL 120 TRM 300 Ps / 3000 RPM
Top Speed: 53 km/h
Weight: around 19-20 Ton
Source:
Private gallery
Munition der Flugzeugbordwaffenmunition 1936-1945
Handbuch des Bergepanzer III