My Good Tower-
It is grand to see you here again!
Your question is an interesting topic, and was explored at one time in the "Bolo" novels written by Keith Laumer in the 1960's
He first imagined the AI Superheavy Armored Tank in the short story "Combat Unit" in 1960, later expanded the concept into a series
of "Bolo" novels, and particularly explored the idea of the AI achieving sufficient self-awareness to be considered a living partner by his
human commander. I highly recommend the series!
Here is an excerpt from the wiki article:https://en.wikipedia.org/wiki/Bolo_(tank
"Bolos as envisioned by Laumer in his future history military SF are described as automated superheavy tanks.
What they have in common—besides enormous firepower—is:
1) their overly large size:
the Bolo Mark I is described as weighing 150 tons,
the Mark II 300 tons
while the much more advanced Mark XXXIII, considered a standard model in the series, weighs 32,000 tons.
In comparison, the largest superheavy tanks of the real world weighed around 100 tons and were never tested in combat.
The enormous Bolos are even described as tank-carriers themselves.
2) their increasingly complex AI:
Where first models are controlled by programming intended to reduce the need for a human crew, later models
mimic human thought patterns, feature strong AIs and finally Psychotronic circuitry, enabling self-awareness,
strategic planning and decision-making, and even conscience.
3) minimized human crew, often consisting only of a single human commander who can either directly control all aspects
of his unit thanks to an advanced interface, or who communicates with his unit, giving it instructions to carry out."
One aspect of the Bolo Supertanks is the complete destruction of any terrain they crawl over, and the resulting collateral damage to buildings, fences, etc.
For a domestic application, one needs roads, and The limit, as our Russian Friend Morozow pointed out, is with the roadway.
Leveling, paving, and maintaining a roadbed ( even if only with rock, sand, and gravel ) wide enough and strong enough for a
Land Behemoth is the problem!
As Morozow also points out, We already have
Land Behemoths, called Railway Trains, which can carry far more than the destroyer example - thousands of tons and hundreds of troops.
Here are two military examples:
Russian Civil War of 1919
And during WWII "everyone" discovered the limitations of railways - they only go where they already are. Thus the great minds of the times
developed superhighways such as the Autobahn, and the U.S. Interstate system - both were literally funded by the federal level governments as "strategic necessities for defense of the state", and the convenience to citizens and commerce was a side benefit.
And now we swing back to Behemoth Airships - the best of all solutions, as they require much less infrastructure!
But wait, they are limited by wind and weather conditions and load limits - an airship that could lift and deliver , only 10 tons :
for example, the Zeppelin Hindenburg, with it's dead weight, crew, fuel, etc. weighed in at
Dead weight 118,000kg or 260,145 lbs. and could manage a Payload for passengers, mail, freight
w/ hydrogen 9,560 kg or 21,076 lbs.
Inflated with hydrogen, Hindenburg was able to carry 21,076 lbs of payload ( only 10 tons).
if the ship had been inflated with helium it could not have made the flight at all, it would have been
34,000 pounds overweight ( due to the lesser buoyancy of helium).
The airship also could not deal with ground winds or bad weather when trying to make deliveries.
By contrast, a flatbed Freight Truck, which can easily navigate even rural roads in nearly any weather
short of a Monsoon or Hurricane, has a Weight Capacity of 48,000 lbs or 24 tons.
Finally there is competition from the Lockheed C-130 Hercules which can deliver a similar load of 45,000 lb and can deliver
nearly anywhere. The C-130 is Capable of using unprepared runways for takeoffs and landings; Lockheed demoed
that it could take off and land from an aircraft carrier, and the C130 is even used to do "air drops" of cargo
from only 50 feet , such as the humanitarian food drops to Ethiopia, Somalia, and more recently Haiti.
so, that's why no monster landships outside of strip mines, rocket launchers, and fiction
prof ( the cold wet fish of reality ) marvel