Before purchasing a new system, (if it were me), I'd try the existing one first. Try it with trailer empty (go for a 10 mile spin), and then load it with your toys and go for the same 10 mile spin. See if it handles OK under both conditions.
If it doesn't feel right, the bars bend, or something happens, then move up to a higher rated WD system.
But I have a feeling you'll know immediately if you hitch up with your existing system, you'll most likely be OK. That 2500 truck has a good suspension. All you need is a little extra 'umph'.
