Somewhere inside your Greyhawk is a rating sheet. Probably stuck to the inside of a kitchen cabinet door, or bathroom cabinet door. It has weight values on it. The "dry" weight, or unladen weight of your Greyhawk, plus the people and all the things you put inside it, including all water and holding tank weight (calculated at about 9 lbs per gallon), cannot exceed the GVWR figure. There is likely also a GCWR figure. Subtract the GVWR from GCWR, and that is the max weight you can tow. There is a sticker inside the door jamb of your Dodge with a vehicle weight. That, plus anything you plan to carry in the pickup, is the number to compare to the max tow weight. If the truck is too heavy, I'd suggest something lighter to tow.
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