[quote=@AvaP]
I'll be getting my modernized Sherman up! The old girl can't have any rest. 
[/quote]

That may be a bit problematic

[quote]This rules out antique vehicles such as most World War 2 tanks and armoured vehicles, as they are long-since retired, other than a few exceptions - but given the setting and how it has advanced, even they would be likely long-gone by the time the RP takes place. 
The general rule of thumb is 'As long as there is a reference page for it online, and it's not an original creation, it should be okay'. Meaning, if you can find a webpage or website with at least some technical details for the vehicle you wish to use [i]and there was at least some kind of effort to construct it[/i], then it's allowed. [/quote]

Still, the M4, Centurion, and T-34 are solid girls. But if it doesn't pan out, may I suggest [url=https://en.wikipedia.org/wiki/Vijayanta]an India-pattern Vickers MBT Mk 1[/url] if T-55 Leon isn't up your dark alleyway?