I hear you, but I dont think the cover provided by the AH terrain is sufficient for this to be effective.
What range could Ostwinds kill it at? What range would M8s kill it at?
The terrain in Darkest Hour provides lots of undulations even in an open field, this things low profile and incredible mobility could be used there, I think it will be meat here.
But thats me.
If you want to put a US tank destroyer in that can deal with Tigers, put in the M36, it can deal with tigers.