Back in the early sixties, before I joined the army, my uncle and I used to do some wargaming. I had some AMX 13s in my inventory. In those days it had a 75mm gun with an autoloader with only 12 rounds in the magazines. They always died very quickly.
You don't like my principles? I have other ones.
I wasn't looking at the AMX-13/Kurassier. I was looking at its 105mm (later model than your 75mm toys) and its twin revolver autoloader with 12 ready rounds total. I just wanted the gun and loader on its trunnions mounted in portee configuration on the JLTV (or the Polaris if possible) for remote/autonomous operation. I wasn't bothered that it wouldn't fire on the move nor that it would have zero protection. The main effort is firepower to support the infantry. A field gun if you will.
6pdr (57mm) portee in North Africa 1942
And here is the JLTV Remote/Autonomous
And then I remembered.
105mm with autoloader - 50 ready rounds
Low to the ground
Operable by one man - remotely if necessary
Too heavy - but remove the armour
Can't fire on the move - but I don't care
Needs a different platform and aiming system - need to work on that
But, critically, it is a 105mm rifle with an autoloader with 50 ready rounds that can be mounted on, aimed and fired from a vehicle to effectively eliminate targets.
And while I can concede that a 105mm rifle is not going to do well against an Abrams, Leo or Challenger, how is it going to do against LAVs, IFVs, APCs and MRAPs?
Anyway - The Swedes
Strv-103, the Swedish cold war advanced cold war self propelled gun
tanks-encyclopedia.com
en.wikipedia.org
Crew of three, one of which faces backwards, all of which can drive the vehicle and operate the gun. And, apparently, in the 1990s, remote operation trials were conducted.
Keep in mind I am not looking at this as a Medium/Heavy Brigade solution. I am looking at something that will add capability to the Light Battalions. Battalions that have already (dare I say it) doctrinally sacrificed protection for mobility. I am sure that any additional firepower they could bring to the fight would be welcome.
And if the enemy does bring tanks to the fray
There are always these
And these
With their 40 km Loitering Missiles.