Caeser's Legion and Two Sun all have focuses that point to the old Tank Tech (CL: the Great Chamber, Legend of the Cannonball, Sacred Engines, and The Garage) (TS: Well Oiled Machine, Bigger than Texas Steel, and Caeser's Hammer)

Tanks do not enter the army. For some reason, it's trivial not to issue tanks to tank battalions, and therefore they do not cause damage and do nothing.
Maybe my mods make this problem...

@Draugar

This is NOT an Vehicles Rework bug but a conflict bug on your end, I do not know what would be causing it.

Foxy I think I found the cause of the missing Tank equipment and missing mechanized divisions for this mod: it was the old world roads mod. I'm running UTCM and the Old world roads compatibility mod for UTCM but was still getting the missing tanks bugs but adding the separate Compatibility mod for vehicles rework and OWR fixed the issue. You may want to put a disclaimer about needing both compatibility mods if anyone wants to use UTCM, OWR and OWBVR together

On a side note, I am not sure if it's a bug but are the early tank techs supposed to have negative defense and piercing stats?

@zsmasher

Were ya not using the compatibility mod that I made for Old World Roads?

Also, yes. If ya don't have the NSB DLC, that is on purpose as its meant to show an evolution in tanks. If ya do have NSB, make better tanks.

I was not cause I had hopefully thought that the UTCM compatibility patch for both OWR and the Vehicle/Air reworks were working in tandem with each other. Plus I just didn't know the OWR/OWBVR patch existed until I started doing the ol' reliable "turn every mod off one at a time until the cause of the problem is found" trick, which lead me to actually finding the patch. There's so many compatibility patches to keep track of.

@zsmasher

All good man, stuff happens.