 Purchased truck used and have had nothing but problems, replaced oil gauge sending unit (common problem) air pressure light needs to be reset (with paper clip, lol) on a regular basis.  And now the transmission went out (common problem)  this will cost over $6000 (most big rigs have cheaper transmissions), upon further investigation it looks like there is a common issue with timing chain guides.  Nissan will not stand behind any of these issues.  Note: I purchased this truck from an older gentleman that garaged it and performed regular maintenance.