My advice based upon personal experience: Keep your existing pin box and sell your Curt hitch. Put your hitch proceeds and pin box savings towards the purchase of TrailerSaver TS3 hitch. Load your trailer how you like, tow with empty tanks and forget about trailer and truck modifications. Let the hitch dissipate 95% of the bouncing and chucking energy generated by the trailer and enjoy your smooth towing experience. In the long run you will be money ahead and will be free to think about other things.