APPLICABLE TEXAS EXPERIENCE here....
While AKICITA in post #4 and Darwin T in post #5 of this Thread have hit on some valid TEXAS applicable points, here is what I found in my checking with City Police and Code Enforcement, City Attorney's Office and the TxDMV Office in Austin, TX:
1. Did you or a previous owner have to pass and obtain an EUC to acquire your MV? - OR - Do MV's of the SAME DESIGN/SPECIFICTAION currently require an EUC to be approved for civilian ownership of such MV?
IF the answer to either question above is YES, then you DO NOT OWN A VEHICLE in the State Of Texas - - What you own is a TACTICAL WEAPON OF WAR that just happens to be able to be registered and driven on the Public Hichways in the State Of Texas.
THAT is your first line of defense against Code Enforcement. (It just looks, smells, tastes, and drives like a vehicle.)
To further validate that defense....
2. Is your MV registered in the State Of Texas as a FORMER MILITARY VEHICLE?
IF this answer is YES, then you have a secondary defense in that the State Of Texas acknowledges through the Texas Department of Motor Vehicles (TxDMV) that you own a piece of Military History that must be maintained and operated for preservation purposes and just happens to allowed to be operated on public rights-of-way for the purposes of display or maintanence (Commercial use is STRICTLY prohibitted as a TxFMV).
THEREBY, it IS NOT a MOTOR VEHICLE, but an HISTORIC ARTIFACT (aka: Lawn Art or Memorabillia) just like any OLD sword, gun, uniform, headgear, patch, canteen, etc.
The TxFMV Registration Rules also states that REGARDLESS OF SIZE OR WEIGHT and WITHOUT INSPECTION or the display of metal license plates or annual registration sticker (nor inspection sticker) your vehicle is similar to a Model T or other antique car registered with TxDMV for Historic Preservation Purposes. TxAntique and TxFMV registration is specifically for non-daily drivers and basically allows you to move your old vehicle around under its own power without having to haul it with another vehicle as you would an antique dresser or vase or grandfather clock or old coin collection - They simply acknowledge that YOUR Antique has wheels and a motor. It's that elementary.
In a pure legal review, you need only ask that the letter of the law, IN THE CONTEXT OF THE SUPPORTING BRIEFS THAT LEAD TO THE PASSAGE OF THE LAW be taken into consideration prior to any decisiion or judgement. With this, the spirit of the TxDMV's DEFINITIONS become indisputable.
Essentially, these two points, make Texas one of the most FMV friendly states in the Uniion. By STATE definitition and paperwork issued by The Great State Of TEXAS, you have bonafide DEFENSE against almost every local Code or Ordinance which attempts to define your Historic Military Artifact as a Motor Vehicle (private or commercial) of ANY SIZE OR WEIGHT.
(DISCLAIMER: I am NOT a Lawyer, nor Legal Professional, but quote for you here guidance based upon my personal experiences under the direction of such professionals.)