Go to Home Depot and pick one up for $30 bucks, no need to spend $150 unless you actually tow something often.
Just a tip, don't leave it in, it will be stolen eventually.
Edit: Never mind, I think we're talking about something else hahah. Regardless, never tow anything 2000lbs or more very far without a transmission cooler. If you pick a cooler up, I still would never push the weight farther then 3500-3700lbs, 4000lbs for short distances. ZJ's not built for it.