Armored cars / unarmored antitank vehicle rules questions [TANKS]

[jtsumrok-at-comcast.net]

Hi, I'm new to the hobby and wanted to introduce myself and ask a few rules 
questions about armored cars unarmored anti-tank vehicles.

My name is John Sumrok and I live in Pittsburgh, PA. Since I'm not that far from 
Maryland, it's possible that I'll be able to do the occasional road trip to Maryland 
to participate in battles.

While I'm working on the plans & details of building a tank (Semovente 75/18), I 
first want to build a 1/6 scale 4x4 armored car or anti-tank vehicle, as I have an 
existing 4x4 RC truck chassis that should have enough torque, duration and 
cross-country mobility to be a usable platform for a 1/6 scale armored car (provided 
I keep the weight down).  

I have a few questions about armored cars and other wheeled combat vehicles:

?  What qualifies as an armored car?  Any limitations on the historical armor or 
armament of the subject vehicle?  Do lightly armed APCs / IFVs qualify as armored 
cars, or does the historical subject vehicle need to have large antitank armament?

- From reading the Battle Reports, there doesn't seem to be much precedent for the 
use of armored cars / armed wheeled vehicles in the battles staged down there in 
Maryland.   Most of the wheeled vehicles which have participated in the battles seem 
to have been unarmed support vehicles. 

- I'm interested in how the following vehicle types would be classified / rated by 
the rules:

**** Typical 4x4 wheeled APC / IFV ****

Examples:  Panhard M3, Renault VAB, Soviet BTR / BRDM series

Typical armament:  MG up to 30 mm
Typical armor:  10-15 mm

Rating?  
20/2?

**** Unarmored 4x4 vehicle with anti-tank armament ****

Examples:  US M274 "Mule" w/106mm recoilless rifle, WW2 British 2-pounder portee, 
Australian Landrover w/106mm recoilless rifle

Typical armament:  recoilless rifle, light antitank gun, ATG missile system
Typical armor:  none

Rating?  
20/1 ?

Sorry for the lengthy message, but I have several potential 1/6 scale wheeled 
vehicles in mind that would work well with the truck chassis I have and I want to 
understand how these types fit within the framework of the rules.  

I understand that the focus of the hobby is on tank vs. tank combat (as it should 
be), and I don't want to upset the equilibrium of things.  Just wondering if 
vehicles of the types described above have a place on the RC tank battlefield.  I'd 
hate to make the trip just to have my toy end up towing supplies!

I'd welcome input & comments from the battle participants, "rules lawyers", etc.  
Looks like a great hobby!

Best regards,

John Sumrok