I pulled up the specs, 8279lb dry with 1521 payload, so a GVWR of 9800lb. GVWR is a good preliminary estimate of what the trailer will weigh going down the road.
Your V6 Jeep was never even close to being within ratings. The V6 has a max tow rating of 6200lb and a payload of 1260lb. Your trailer is 50% over the tow rating and you should be looking at 1200-1500lb hitch weight (which counts against payload and you want in the 12-15% range for good towing), so you are at or over payload before putting a single person in the Jeep or anything else for that matter.
1/2 ton trucks get tricky. There are rare models with up to 2500lb of payload that you might get to work but the vast majority have payloads in the 1000-1600lb range. They won't be significantly better than the jeep. If you are set on a half ton truck, really watch the ratings and as way2roll said, lots of other things count against payload.
Honestly, I would jump straight to 3/4 ton trucks. At the low end, they have payloads in the 2800-3000lb range, so you can handle the hitch weight and still take people and gear in the truck. While diesel is nice, it's overkill. I would look for the larger gas engine (6.0-7.5l depending on brand). That will handle a 10k trailer comfortably.