Activating this trainer

If not state otherwise below, press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options

# Player 
     NumPad1: God Mode
     NumPad2: Unlimited Health
     NumPad3: Unlimited Shield
     NumPad4: Unlimited Overshield
     NumPad5: Unlimited Jumps

# Skills 
     NumPad6: Fast Skill Cooldowns

# Weapons 
     NumPad7: Unlimited Ammo
     NumPad8: No Reload
     NumPad9: Infinite Ammo
     Multiply: Infinite Ammo Clip

# Items 
     Add: Unlimited Grenades
     Separator: Fast Repair Kit Cooldown

# Enemies 
     Subtract: Super Damage

# Gameplay 
     Decimal: Game Speed

Editor Options

# Currency 
     Cash
     E Currency

# Player Stats 
     Max Health
     Current Health
     Max Shield
     Current Shield
     Max OverShield
     Current OverShield
     Damage Dealt Multiplier Current
     Damage Dealt Multiplier Base

# Progression 
     Level
     XP
     XP Earned Previous Levels
     XP Needed to Level Up
     Vault Hunter Level

# Skills and Upgrades 
     Skill Points
     SDU Tokens

# Backpack 
     Inventory Size

# Inventory 
     Ammo Type 1
     Ammo Type 2
     Ammo Type 3
     Ammo Type 4
     Ammo Type 5

Notes

God Mode:
This may make you simply not present as if your body isn't there.  If the story won't progress or something isn't interactable, you may have to go to main menu, toggle this off, then come back into the game and try again.

Inventory Size:
Do not use number larger than 28