I was in the same situation a few months ago but knew there was no way my 1500 was going to handle the 8,800 lbs trailer my wife want. Her choice of trailer forced me into a 3/4 ton truck.
That said I investigated everything I could (upgrades to the truck as well as trying to find a trailer that had everything she wanted that was under 6,700 lbs) but no joy.
In my opinion if your truck has been handling the trailer o.k., none of the towing limits are being exceeded and we're talking 5 short trips a year I'd be sticking with the truck you have.