This RV appears to be made for the rental market, therefore there is not much literature available for it. Rental units aren't often used for towing.
The E350 chassis with the V10 engine typically typically has a 12.5K lb GVWR and an 18.5K lb GCWR. Off the top of my head, I don't know if the ratings are derated with the V8. If you're at or near the GVWR, which is easy to do on the E350 chassis, you could theoretically flat tow up to 6,000 lbs if your hitch is rated that high. Otherwise, you're limited by the hitch rating. Is there some type of hitch manufacturer's name and/or model number on it? Post it here, which might help us figure it out.
In order to know how much weight (motorcycle, trailer tongue weight, etc) you can hang off of the hitch, you really need to weigh your ready to travel MH. Run it across a truck scale and weigh the front and rear axles. You should have a placard somewhere inside the motorhome that you can compare actual to design weights. My guess is that you won't have much reserve capacity to haul a motorcycle.
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Fran, Mary & Zoey (silver Cocker)
2017 Thor Axis 25.5 "RUV", Ford E-450, V10, 6 speed
2016 Chevy Sonic LTZ Auto Hatchback 4-down
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