Since leaf springs worked for the Panzer Mk IV thru the end of the war, stick with that.
Cheap and fast to build.
They needed to work on higher HP engines and welding.
One gives you more power, and welding saves weight.
That translates into larger, better armored tanks with a better gun.
But 1940 is pretty late
View attachment 710437
this was their 26 ton 'Heavy' tank with 50mm armor and a 75mm/L34. Two man turret
So a little worse than a Sherman, but this wasn't produced in number before they surrendered.
Thanks for nothing, FIAT
Good reading here
A blog about World War II era archive documents, primarily dealing with armoured warfare.
www.tankarchives.ca