Exactly, There is absolutely no reason for a vehicle to have four o2 sensors.
I had a 88 one ton Dodge van with the small block and got 368k out of it. The biggest problem I had was I had to change the starter solenoid on a regular basis but I kept the tools in the truck and swapped it out in the parking lot at work -- it took about 15-20 minutes
One of the biggest problems of the Jeeps, and the CELs that come on almost constantly.
Still, I love the Jeeps. Chrysler be damned, Jeeps are ....well, Jeeps.
There is yet a day that I drive that I don't get the "Jeep Wave" from other drivers. I cannot think of another band with this kind of bond among drivers, other than Classic Cars.