I've been looking at pictures and trying to find information on the T49 and T67 experimental US tank destroyers:
The line I see repeated on the internet is that these were some sort of proto-hellcat designs. The problem with this theory is that the running gear and suspension is clearly completely different.
As you can see, the T49 and T67 have a rear drive sprocket. They also have independently suspended road wheels sprung by coil springs, rather like a merkava Mk III/IV.
The M18 had a front drive sprocket and torsion bar suspension, which IIRC shared parts with the M41 light tank:
So what's the story of these vehicles?
Edited by Loopycrank, 30 April 2013 - 0411 AM.