As an alternative, use one of the old Standard Excuses: No wheels/tracks - “It’s hull down”.
(Some of the others being:
Model is overscale - “It’s German”
Model is underscale - “It’s Japanese/Italian”
Model assembled from parts of differing scales - “It’s British”
Turret missing - “It’s an ARV”
Turret only - “It’s dug in”)
The other use is as a basis for a Sci-Fi Hovertank…
Cheers,
M