no it can't
it's either an assault gun or self propelled gun depending on which cannon it has mounted.
yes but you get what I mean
like lets say a panzer 38 (t)
thats a tank
take off the turret and put a 75mm on the hull and its a
jagdpanzerTD, at least thats a good example I think.
its in technical terms still a tank, I don't know it always bugged me with stuff like that how its still a tank but classified as something else
I guess for something like a priest that would make sense