[Christocipher]

I picked class's AAtruck, SPFlak, lightSPAAVehicle. It is a bit confusing for me because most of the AATrucks are in SPFlak. I looked at the country where the SPAA guns are all the proper real size and then I showed which other SPFlak are too big compared to that country. The countries I used for real sizes are USofA and Great Britian.

Here it is

All the AA Trucks are size 3 except 2 size 4 French AA Trucks units 323 and 324 and 4 size 4 Soviet trucks, units 667 668 40 69 which are GAZ AA Trucks The French trucks are really smaller than most of the other size 3 AA Trucks. The French trucks do have 40mm guns, but there are lots of other size 3 AA Trucks with 37mm and 40mm that are all size 3. The French size 3 unit 86, M16 SPAA half track with a quad 50 cal is for sure bigger than the french size 4 AA Trucks. Soviet half track unit 90 ZSU-M15A1 is size 3 as well but with a big boxy 37mm AA mount and bigger than the 4 GAZ AA trucks.
Spanish unit 272 AA Truck is size 5 but looks to be the same truck as Spanish unit 78 AA Motoriz Azul which is size 3.

German units 869 and 61 Flakpanzer 1/A and Flakpanzer 38 are size 3 but are really size 2 using Great Britian as the benchmark. To save you time I put in the height width and length so you can see. UK unit 106 Mk VI AA is 4.0 2.08 2.35. German unit 869 Flakpanzer 1/A is 4.02 2.06 1.97. German unit 61 Flakpanzer 38 is 4.61 2.15 2.25.

Nearly all the AA vehicles are size 3. 16 are size 4, 12 without the GAZ AA trucks, Of those 12 left are all tanks, except for 4 German halftracks. But using US size 3 AA halftracks as the benchmark the 4 German halftracks are really size 3. USA unit 25 M16 MGMC is 6.5 2.16 2.62 and unit 64 M15 MGMC is 6 2.5 2.64. German halftracks are unit 62 SdKfz 7/1 FlaK 6.85 2.35 2.62. Unit 324 SdKfz 6/2 FlaK 6.33 2.26 2.50. Unit 482 SdKfz 7/1 FlaK 6.85 2.35 2.62. Unit 483 SdKfz 7/2 FlaK 6.85 2.35 2.62.

Same benchmark makes size 4 Cananda, UK and India, unit 105 and Polish unit 185 Crusader AA mkII at 5.97 2.77 2.38 also really a size 3.

There are 4 size 5 AA not counting the Spanish AA truck. Canadian Unit 18 Skink AA 5.82 2.62 3.0. German units 175 Moebelwagen 5.92 2.95 2.73. 63 Wirbelwind 5.89 2.88 2.76 and 64 Ostwind 5.92 2.95 2.9 (2.76 without the teeny weeney bit of gunshield that sticks up 40cm). So UK and Canada size 4 unit 80 Crusader AA Mk I at 5.97 2.77 2.9 is really a size 5 as well.