How to customize players groups loadout in TTT?

I would like to customize the players groups (Innocent, Detective and Traitor) loadout in a TTT gamemode. I would like to be able to remove and add new weapons to the loadout of each group, can someone point me to a direction? There is any sort of configuration file where I can specify it? I would like to do not need to change to default gamemode code if possible.

Edit SWEP.InLoadoutFor

I already know that, I’d like to modify the loadout (that includes adding and removing) when the round starts, for example: When a new round starts Traitors will spawn will the following loadout {RPG, M4A1}, so basically I removed the other weapons from to loadout and add new ones.

 hook.Add("TTTBeginRound", "TraitorRemove", function()
for k,v in pairs(player.GetAll()) do
if v:IsTraitor() then

Untested code.