That 460 has the grunt to tow your Jeep but you're right about steep grades, you'll still feel it.
You found a vehicle-mounted towbar, maybe a Roadmaster Stowmaster 5000. You'll still need a baseplate to mount the SM5000 to the Cherokee. I have one of those, different brand, same idea. Actually would like to sell it, went with a Roadmaster Falcon that stays on the motorhome when not towing. Either works just fine. The vehicle-mounted is quicker to connect, disconnect and fold, by a few seconds. I just didn't want that hardware on the front. We tow a Frontier that can easily handle the weight, but our Corolla feels the towbar out there on the front when it's folded. Cherokee shouldn't. I think some of the Wrangler crowd likes the look of a folded towbar.
You should be able to install a baseplate easily. You might find a used one.
