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Hi Gary
You didn't mention what year your truck was, what engine it had, etc. (Do you really have 18 inch wheels, or was that a typo?)
Anyway, you are probably exceeding the GCWR for a F-250, but if your truck is a recent model you are right that the only difference between it and the F-350 is the rear spacer. So if you don't mind sticking your neck out a little bit, you are probably OK.
It is a good idea to know how close you are to the manufacturer's limits. Weigh your unit (when fully loaded for a trip) on a CAT scale. Many truck stops have them, and it only costs about 8 bucks if you tell them you want two weighings. The first weighing is with the separate truck axles on two of the three pads (with the two trailer axles on the third pad). Then move up for the second weighing putting the trailer axles on two of the three pads. This should give you info as to how much you are pushing your weight limits.
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