Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad1: Super Money Income
NumPad2: Two Hit Kills
NumPad3: Free Cargo Shopping
NumPad4: Rapid Fire
NumPad5: No Ability Cooldown
Super Money Income: While active the money you get per kill is replaced with a specific value which you can define using the editor.
Two Hit Kills: While active you kill enemies with a maximum of two hits only.
Free Cargo Shopping: While active your (unlocked) cargo amount will not decrease when you buy something. You will still need to have required cargo amount.
Unlock more trainer options including updates from here - Transport Defender Trainer