50,000 is it even broken in yet?
I did my brakes at 180,000 and that was because I had a rear cylinder leak. 25,000 later I had a front caliper sieze up.
The brakes on your jeep, especially if it has a manual transmission will last long long time.
After that, a Jeep is just like a car. Change your oil at regular intervals, change gear oil if you have been in water, if she has an automatic that should also be serviced regurlarly, I prefer to have the pan dropped, cleaned, and converter and cooiling drained at the same time.