Brian 
2006 Nissan Frontier Crew Cab SE 4dr Crew Cab 4WD SB (4.0L 6cyl 5A)
BUYER BEWARE
 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.