This failed and confirmed that the chassis had reached the limit of its adaptability in both weight and available volume .
F tank design , and partly developed by Rheinmetall from early 1944 onwards -- to a Panzer IV hull .
This failed and confirmed that the chassis had reached the limit of Panzer IV 's adaptability in both weight and available volume .
F tank design , and partly developed by Rheinmetall from early 1944 onwards -- to a Panzer IV hull .