u/HashutAttorney

I hate when memetic fanon is treated as canon by so-called 'lore authorities'. GW can't introduce basic bitch armored cars and half tracks without fanon based complaining they break lore because they are new.

Millions of worlds means a dizzying array of equipment that is not represented by the limited range of irl model kits. The 'excuse' that we have not seen them before is perfectly valid explanation because 40k's scale is vast. Having or not having a kit does not determine the existence of something in an Imperium of a million worlds.
They are fucking armored trucks and cars. Find me a single scrap of evidence Admech would give two shits about the greater Imperium using or making basic equipment that is in no way advanced and is just day to day stuff any 20th century level + planet would need to function. Find me the lore that says Admech have to rubber stamp everything I dare you. Ugh.

Fanon: The 95 Ton Experimental Centaur 'Mechtank' was an attempt by the Amaris Regime to produce war machines that were easy to pilot to counter SLDF's advantage in seasoned Mechwarrior veterans. By merging tank and mech technologies a driver could drive the simple tank while a gunner fired its weapon systems. The Centaur was equipped with Ferro Fibrous armor, double heat sinks and an extra-light engine. It carried twin class five cannons in each torso, a battery of four medium lasers in its right arm and an Arrow IV missile launcher in its left arm. A single machinegun located in the tank was operated by the driver.

Only a handful of prototypes were produced and all were destroyed during the Siege of Terra when its fascility self destructed to deny SLDF forces from capturing the technology.

Luetin09 being absurd about basic Imperial vehicles