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 injection pump or injector work

A 2003 Cummins is not the year to get as I am pretty sure the fuel pump is mounted on the engine. In 2004 and later years they moved it to inside the fuel tank where it belongs.

It was actually 05 and later. Dodge has a retro kit for the pumps mounted on the engine.