Fully loaded Kaiyen with gear, gas, spare tire, etc. is around 6500# or less. Add 500lbs of lead for future and you are looking at 7000#. Durango will certainly have the power my only worry would be the tongue weight pushing down on it. Still a "mid-size" suv frame but at least it is once again a frame based suv (2021) and not uni-body.
You aren;t towing 100% of the time so yes it would handle your current toy.