Hi All
German OOB Unit 060 "SdKfz 10/4 FlaK" has size 3. Unit 436 "SdKfz 10", Unit 480 "SdKfz 10/5 PaK", Unit 481 "SdKfz 10/5 PaK5" have size 4 they are all the 'same' vehicle. They have the smaller dimensions (notably height) than the protze.
ie protze from
http://en.wikipedia.org/wiki/Krupp_Protze
has Weight 2450 kg
Length 5.10 m
Width 1.93 m
Height 1.96 m
sdkfz 10 from
http://en.wikipedia.org/wiki/SdKfz_10
has Weight 4,900 kg
Length 4.74 m
Width 1.83 m
Height 1.62 m
As the protze has a size of 2 then so German units 060, 480, 481 and 436 should be size 2 also, not 3 or 4.
25000 sdkfz 10 were produced and it had a carrying capacity of 8 men.
Best Regards Chuck.