Hi for my 2 cents worth.
After every drive, turn off radio/music once on asphalt, build speed slowly to listen for any new noises. Wiggle the steering and also use speed bumps to your advantage.
I generally half the recommended service intervals for all service items. Including transmission and diff fluids. When the car is up on the ramp at the workshop, I walk through the underside of the car with the mechanic and check for any issues. On the pajero check status of all suspension bushes, engine and transmission mounts, steering rack, shocks and springs. All of these have needed some maintenance on mine over the last 2 years.
Wheel alignment every 1 to 2 months depending on driving, or when something feels out.
Wash on a regular basis but full underbody was every 6 months or so, unless have been in a muddy area. Compressed air in the engine bay.
Keep air filter clean and change every service.