Looking to buy a 2003 Cummins 4x4 auto. 180,000 miles. Well taken care of clean truck.

I would use it for general truck use and hauling cars on open trailer. Max 2500 miles a year. I won’t use it for daily driving.
What can you tell me about these trucks. Don’t tell me to buy a hemi truck, not going there.
When does any trans problems show up?
When do they need fuel system or injector work
Anything’s to Look out for or problems they have. Thanks!