We have an 04 3500 dually that we use to tow a 22K lb trailer... the trailer is licensed for 24K but we've always kept it under that... . it has power disc brakes... .
Of course our drive has a CDL, which you'd need if you exceed 26K total weight of truck and trailer, medical certificate, and if your going from state to state, apportioned plates and log book...
One word of caution... . most states are ruthless on out of state drivers towing for hire with out the correct permits and or license...