Rear axle leak on 2001 Jeep Grand Cherokee

I have been told I have a rear axle leak and that it is common in this vehicle. The fluid supposedly has saturated the "brake lines" I think they said. I was quoted $982 to fix it. I maybe towing a camper in a few weeks and I want to know what the safety issues are if it is not fixed before then and is this a fair price. Really don't want to sink this kind of money into this vehicle at this time! How safe is it to drive this vehicle in its current condition?

Sounds high to me! However I don't know the extent of what exactly needs to be done either!!