Also, the E-450 has Gross Combined Weight Rating of 22,000 pounds, so your tow rating can be as high as the rated 8,000 pound hitch (must check to confirm) as long as the motorhome’s weight stays at or below 14,000 pounds (22,000 - 14,000).
Towing a trailer you’ll probably be limited first by tongue weight. Check that on hitch also (often 500 pounds).
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