[Vince]

Why is evident that something like houses or objects gets their own separate tables, yet everything related to the player is crammed into one table? If you need to add a number to a column name then you're doing it wrong. MySQL is an RDBMS. Relational Database Management System. With the emphasis on that first word.

Each player can have zero or more vehicles. That's the first one-to-many relation. Each vehicle can have zero or mods. That's the second one-to-many relation.