Update 2019
I have tested the Vodafone Automotive AK4615 on the 2019 Facelift version of the Triton. I’m happy to say that the alarm now works in that new model too.
All information from the original post remains relevant.

2019 Mitsubishi Triton Alarm
Original Post Below:
The Mitsubishi Triton as it is known here in New Zealand is also badged as the L200 in other lands.
The current version which was released in 2015 comes with factory keyless entry and immobiliser but lacks an alarm.
Last week I installed a Cobra AK4615 CAN-BUS upgrade alarm to one so I’ve put this post up to show how it looks when installed in the vehicle.
The siren is hidden and it nice and loud when combined with the horn.
Mitsubishi Triton Alarm

Mitsubishi Triton 2015-
Photos of the Triton alarm installed:

Tidy Cobra Ultrasonic Sensors fitted in the Mitsubishi Triton

Cobra Alarm LED Located in the centre console of the Triton

Triton remote key operates the alarm
Previous Generation Mitsubishi Triton 2006-2015
The old version also came with a factory transponder immobiliser and remote keyless entry so the AK4615 will work on PLIP mode.
Any OEM upgrade alarm should work if installed well, a remote upgrade alarm is also an option.
Options:
- PIR sensor for Canopy
- Double Tap Module to prevent re-locking
- Level Sensor