Do you know what chassis you have? (E350, or E450)
The hitch is rated for 8000lbs but you probably can't tow that much. Your best bet is to take the unit to a scale (like a
Cat Scale). Subtract that weight from your gross combined weight (GCWR: 18,500 lbs for E350, 22,000 for E450) and that will be what you can tow. If you are planning to tow a trailer (and not a toad) you'll also have to consider the tongue weight (GVWR - scaled weight will give you max tongue weight).
In our case our Axis 24.1 is on the E350 chassis and only has a 5000 lb hitch (very early model). When I weighed it it came to about 11,500 lbs which means, according to the math, we can tow around 7,000lbs (but we can't because the hitch limits us). We tow either my wife's Escape (3600 lbs) or my C-Max (3800 lbs) on a dolly (about 400 lbs) without issue.
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