I had an 86 hardbody with well over 100k miles on it. I sold it to a friend when I joined the military and he drove the piss out of it too. I had a 2x4 frontier and I currently have a frontier "desert runner". The can take a serious beating and if you treat them to regular maintenance, they will last forever. All of my nissan trucks had suspension kit on them so the majority of my mechaincal issues evolved from me beating them up in the dirt. If you're interested in some kick ass suspension for it you should check out chaosfab.com
The black frontier is my old truck.