Your tow rig

You'll pull that weight easy, the question is will do you have enough drive axle suspension for your hitch weight and what ever is in the bed. As stated the older Mega cabs had those soft spring resulting in low payloads. Without knowing your weights it's pretty hard to give you good advice. Rear axle ratio determines your GCWR or how much it will tow according to the manufacture. Lots of folks tow over GCWR since it's merely a rating, not law. Visit a scale and you'll get better answers.
OBTW no way I would tow 30k lbs even in a new Ram although they are rated close to that figure.