The "ton" designations are from a by-gone era and should be eliminated. Trucks are listed as 1500, 2500, and 3500 for Ram and Chevy, Ford uses one less zero.
Even these numbers are of little value. A modern day 2500 has more payload than some older model 3500 trucks. A modern 1500 truck often has a higher tow rating than older 2500 trucks.
You basically need to pick a trailer, determine it's loaded weight and pin weight and pick a truck with enough capacity to properly pull it. This does require research and math but is the only way to get it right.
It's always better to have a bigger truck than you need then to make do with one that is barely large enough or not large enough. There is a huge difference between a 1500 truck's frame axles, brakes, etc. vs. a 2500 series. There is often very little difference between a 2500 and a 3500.
For the size trailer you're considering a 3500 dually is probably a minimum. Depending on the truck, trailer, and how much stuff you pack in it you may need something even larger.