I have one also, but not as loaded. we have 58,000 miles on ours and so far only an O2 sensor replaced at $300, and a couple of ignition coils under warranty a couple of years ago. The rear wheels bearings make a lot of noise, bu tthey always did. I am waiting for the transmission to die any day as it is one of the bad ones from this site...
http://www.aa1car.com/library/transmission_ford_ax4s.htm
we got 31mpg on the highway at 75mph all day with the A/C on, so thats good.