Here is an example of how one might try and rig a Sherman tank suspension if one was so inclined too :)
This is very similar to the approach I used for the Panther tank. Its using intersect constraints along with distance constraints to get the wheel height and body lock required to make things work. The video shows a broad overview of the techniques used and you can get the sample file on Luxology's asset sharing site if you would like to check it out in more detail.
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