Look in the drivers door jamb for a yellow sticker, will state something like "Passengers and cargo should not exceed "XXXX"lbs. What is that amount, maybe 1900lbs or so?
The 5ver's DRY PIN WEIGHT alone is stated as 1780lbs, before anything is loaded inside, and before the hitch is mounted in the bed, so you will be over your GVWR and probably your RAR (rear axle rating) once loaded up and all passengers are in the truck. Definitely in 25/3500 truck territory with this one.
From what I found on the 320bhds the dry hitch weight is about 800lbs, so this is possibly within the trucks capability depending on how many passengers are in the truck (and what their total weight is), and how much you load in the bed of the truck.