However, while this may have held true compared with the first generation German tanks such as the Panzer III and Panzer IV, comparative testing with the second generation German tanks (Panther and Tiger) conducted by the Germans at their
Kummersdorf testing facility, as well as by the U.S.
2nd Armored Division, proved otherwise, possibly hinting at the complex overlapped and interleaved
Schachtellaufwerk road wheel system used on the Panther and Tiger I, and the simpler overlapping all-steel, internally sprung road wheels of the heavier
King Tiger German tanks.
Lieutenant Colonel Wilson M. Hawkins of the 2nd AD wrote the following comparing the US M4 Sherman and German
Panther in a report to Allied headquarters:
It has been claimed that our tank is the more maneuverable. In recent tests we put a captured German Mark V [Panther] against all models of our own. The German tank was the faster, both across country and on the highway and could make sharper turns. It was also the better hill climber.
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This was backed up in an interview with Technical Sergeant Willard D. May of the 2nd AD who commented:
Staff Sergeant and Tank Platoon Sergeant Charles A. Carden completes the comparison in his report:
The Mark V [Panther] and VI [Tiger] in my opinion have more maneuverability and certainly more flotation. I have seen in many cases where the Mark V and VI tanks could maneuver nicely over ground where the M4 would bog down. On one occasion I saw at least 10
Royal Tigers [Tiger II] make a counter attack against us over ground that for us was nearly impassable.
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U.S. crews found that on soft ground such as mud or snow, the narrow tracks gave poor (i.e., high) ground pressure compared to wide-tracked second-generation German tanks such as the Panther and the Tiger — these two tanks used the so-called
Schachtellaufwerk overlapping, and interleaved roadwheel suspension system pioneered on German half-track vehicles before World War II, but which were troublesome in both
muddy road and
bad winter weather conditions and when repairs were needed. Soviet experiences were similar, and tracks were modified to give better grip in the snow. The U.S. Army issued extended end connectors, "
grousers" or "duckbills" to add width to the standard tracks as a stopgap solution. Duckbills began to reach front-line tank battalions in July 1944, and were original factory equipment for the heavy M4A3E2 Jumbo to compensate for the extra weight of armor. The M4A3E8 "Easy Eight" Shermans and other late models with wider-tracked HVSS suspension and twinned road wheels on each axle — rather than the single road wheel of the VVSS suspension designs — corrected these problems but formed only a small proportion of the tanks in service even in 1945.