Towing? You don't need a 2500 but like Scottie said, you need a good engine. Over the past 10 years I've trailered my jeep behind a 5.3, 2 different 6.0's and a 6.2. All gassers. 5.3 sucked. The rest did well. One was a 2500, all the others were 1500's. There was no benefit to the 2500 but it certainly rode rough.
Don't waste your money on a 454.