Brady, if you add the delivery vehicle of the German Goliath, you would be adding humans (since the Goliath was a wire controlled explosive device on tracks).
IMHO before any new gv:s are included, the ground combat aspect of AH needs a major overhaul. Just to name a few things, gun ranges, gun penetration, damage model, ground model (i e no blow up on hitting tree, more ground clutter to hide in) as it is now, adding more gv:s would only be adding more frustration. Especially if you add Panthers or Tigers and have Ostwinds kill them off.
When we have a working ground combat dimension, I would like to see:
StuG IIIG
Pz VD (Panther)
T-34/85
SU-100
M4A3 76 (w) (Sherman)
M36 (Jackson)
Why this combination? The SU-100 and M36 can take out a Panther with a front hit at good ranges. StuGIIIG, T-34/85 and Sherman are all relatively evenly matched. Panther, SU-100 and M36 would be "cheap" perk vehicles.
Also, these town killers should/could be added to take out towns and bases.
StuH42
JSU-152
M4A3 (105)