People saying there's no room for SPG's in RO: you're completely wrong.
You have no idea how much mayhem one can cause with the STUG3 that's in the game, and that's a severely limited SPG... no co-axial mg, no on-top mg, no newer model(stug4, stug4 schurzen(skirts))... etc.
A jagdpanzer(pz4), jagdpanther, elefant or jagdtiger would have a nice place in the game although the greatest advantage of a tank destroyer is the low profile, IMO the best implementation we could ask for in RO is to have the STUGIV Schurzen with complete camo/foliage setup to blend in with the enviroment, taking full advantage of its low profile(needs the co-axial mg too).
Also: jagdpanther? HA! I'd rather have a Jagdtiger, the most massive tank of the war iirc.