I think the effectiveness of the RPG against vehicles needs to be improved. Some ways that could be done include more damage, lower turn radius, more ammo, and increased speed, and research to do those things. Another possibility would be raising the viewpoint (but not firing point) of a grenadier using an RPG by maybe half their height. This would make firing from behind walls or in a ditch practical. An engineer walling in a grenadier with an ammo crate might become practical, which is somewhat silly, but a rifleman could run up and grenade the guy or a grenadier could mortar him.
