If you have a 2000 to 2004 Frontier or Xterra, you can fit 31x10.5x15 offroad tire. These are much chunkier than regular tires. To keep it from rubbing, which is not a big deal, you would need a poor mans lift (PML). This includes longer shackles ($55) and cranking up the factory front torsion bars. Later, you can upgrade those to Sway A Way (SAW) bars.