The M7 Mines are cheap at 5 munitions and should be planted by your riflemen whenever possible, in clusters of no more than 3. The mines can do engine damage of all types - up to and including immobilization; the chances increasing with the number of mines hit - maxing out at 3.
My replay tells the opposite, jadpanzer IV and command panther literally drive through the cluster with bare minimal damage. This is not the first time i have encounter this, but several times previously, hence i always back track and get an M20.
Anyone could explain to me how it supposed to be done.