+1
How about the American 105mm?
Was just thinking, you could have a Deuce and a Half which you drive around to say the top of the hill, when you "jetson" the gun - its free to move like a 17 lb gun except it has no bunker or what not, nor optics but you do have a range finder for distance and whatever a normal load carries of ammo.
Only problem is once its deployed I dont think you can pack it up or shouldn't be able too. Nice wish though