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(Login zappa93) Missing-Lynx members 22.214.171.124
The short answer...
November 3 2011, 6:13 PM
...is that each half-track type was designed to tow a load (trailer or gun) in a specific weight class.
'2, for a half-ton.
'10, for 1-ton.
'11, for 3-tons.
'6, for 5-tons.
'7, for 8-tons.
'8, for 12-tons.
'9, for 18-tons.
These were all essentially pre-war designs, except for the Sd.Kfz.2 (Kettenkraftrad), which was part of the HK-series, and the only one of that series to see mass production.
The s.WS was the wartime attempt to reduce the number of different half-track types and replace the 3- and 5-tonners. A smaller vehicle, the l.WS, seen in prototype form only, would have replaced the 1-tonner.
The longer answer will require a book-length discourse.