are there any factory disc brakes that I can put on my 91 jeep cherokee? has anyone done this? I tow a trailer, and the rear drums are not doing it. thanks.

 

You should get a trailer brake system... would be more cost effective and work just as well.

I'm not too familiar with an aftermarket rear disc brake setup for the XJ..

 

How much does the trailer weigh loaded?
If the brakes are in good shape and you are not pulling beyond the specs for the jeep you should not need to upgrade the drums.

Fully loaded my truck and trailer gross out at 80,000 lbs. And I have drums all the way around.