Hi There, I'm Clay a certified master automobile technician with 30 years of automotive repair and diagnostic experience.
In my professional opinion the only way to determine an engines integrity is to have the engines oil analyzed. An engine oil analysis will tell the complete story of all of the internal engine problems by the metal and liquid contaminates that are washed into the oil pan by the engines oil. Fairly simple to do. With an Engine Oil Analysis Kit take a sample and send it to the lab for analysis. The laboratory will basically burn the oil in a spectrometer and measure the amounts metals, silicons, liquids, plastics...I had one of these machines several years ago, wish I still had one.
We used a 92 Cherokee as a shop truck for years to push and pull anything in and around the shop when the Jeep wasn't heavy enough a half dozen blocks in the back took care of the weight problem. The Cherokee had the 4.0 HO, much better than any of the V8's offered by Jeep and the complete Chrysler division, in my opinion. My truck is an 88 4x4 F250 5.8 Super Duty. I've had better luck with Ford trucks in my life than any other vehicle I've owned, well except for my little Buick, but it's just a grocery getter. Most all dealerships will offer a decent trade value for your Jeep, if not, like you say turn it into a plow truck with blocks in the back. For domestic trucks I'd go with Ford, they offer the most in heavy duty applications with the best creature comforts. Again with the engine oil analysis take samples of the liquids and have them checked before you buy, for used vehicles. Oil analysis's can be uses for all of the oils from the vehicle.
Don't worry about venting, you should hear me cut loose at times.
I hope this information is helpful. If you have any questions let me know. You can reply back to me through this thread at any time.
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