I'm sorry, I didn't make that very clear....possibly because these calculations are not in my job description. What I need to know is with those engine/rear end numbers and with the numbers on the 2604, will we be in safe range with this combo. Did that make any better sense....I doubt it, but hope somebody can help us. Somehow I seem to remember (??) that the tongue weight should be x% of the GVWR or maybe not. Like I said, not in my job description. DH cannot find this in the owners manual and the Ford dealer thought it sounded fine, but wasn't sure. Not a close enough answer. Maybe I need to go out and retrieve the owners manual to double check the info. UGH! Maybe we should just keep the ROO - gonna cry if it leaves.