This is my procedure - I've had a TT for 20 years
After every trip:
Wash the outside
Clean the inside
Check tire pressure and check wheel nuts
Do a quick walk around and fix anything that may have come loose
Adjust brake if required
Check all bulbs
Every year:
Winterize in December
Crawl underneath and check everything
Spray the frame with Oil/WD40
Check wheel bearings and brakes (usually every other year)
Check tires for age/cracking
Does not take that long and gives you piece of mind that things are working
properly.
My 10 year old TT still looks brand new and everything works.
