Don't believe the combined weight ratings
My little half ton had a rating of 9,000lb for a loaded TT. I can tell you first hand that towing only 7500 (29 ft.) TT was a horror ride from Pa to Tx. I had WD bars on that combo along with sway con...
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There is more to setting up a tow vehicle than just the weight of the trailer. Tire pressures, axle weights, hitch setup, etc. all play into it. When you bump up against a tow rating, if things aren't dialed in just so you have issues like you described. The 2500 series truck "fixed" the problem because everything about that truck is bigger and heavier. But if your trailer were 13000 pounds instead of 7500, any of those aforementioned variables being out of spec would affect how the 2500 drove, just like a 1500 series truck pulling 7500 pounds.
