The Kilo Tray Ballas used to be based in Glen Park, and also control the western part of Willowfield. Since the Ballas were probably formed in Glen Park or Jefferson, it is likely they were one of the original sets of Ballas. However, they used to not be as powerful as other sets, specifically the Front Yard and Rollin' Heights sets.
Now, about their tags...The Kilo Tray Ballas tag shows a few crossed out letters, each representing their beef with certain gangs.
The crossed out O represented their beef with Orange Grove, the original Grove Street Subset.
The crossed out and upside down A represents their beef with Aztecas, but also with Vagos (Since the A is upside down).
The crossed out Bs, Rs and Is represent their beef towards other Ballas sets, specifically Rolling Heights Ballas and Front Yard Ballas. This shows the fact that KTB is BallasK.
2.Kilo Tray Ballas in the apocalypse
After the outbreak took place and gave time for the virus to set in and attack the world, most gang members became zombies, only the luckiest and most skilled managing to stay alive.
Armani Webb, a business owner and a known high ranking KTB member from the Glen Park area, did his best to keep the set as secure as possible during these events, since they weren't only threatened by the zombies, but also by rival gangs who looked to bury them. Austin Warfare, another high ranking KTB member, returned to the hood after deserting from the military. This event created internal conflict inside the gang, splitting it in two and creating some sort of civil war. The surviving ones became more organized under the leadership of Armani and Austin. Slowly but surely, the virus spread along the big cities, forcing them to migrate to the countryside.