Had a quick look but may be wrong and I can't see a thread about this already so can someone make it a sticky?
Here's some ideas I have had for making your landy safer, feel free to add on
Locking the t/b in low box and in 5th gear
Pedal locks, xeng do a very good one
Removable steering wheel
Steering wheel lock
Tracker
Cut off solenoids for the fuel lines
Locking the handbrake on
Kiltech
Wheel clamp
Boxing it in with other vehicles
Immobiliser
Isolator switches
Here's some ideas I have had for making your landy safer, feel free to add on
Locking the t/b in low box and in 5th gear
Pedal locks, xeng do a very good one
Removable steering wheel
Steering wheel lock
Tracker
Cut off solenoids for the fuel lines
Locking the handbrake on
Kiltech
Wheel clamp
Boxing it in with other vehicles
Immobiliser
Isolator switches