There is a new tire out there (I'll refer to it as the Euro C). it is designed for cargo vans.
The Continental tire you link to is one of them. The size carries the C after the designation. Much higher weight rating than a standard LT tire. There only a few manufacturers producing the tire.
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Nexen Roanian CT8. Top four tire sizes in the chart at this link are the Euro C sizes (fourth down is your 225/75R16C)
https://www.nexentireusa.com/tires/suv-light-truck/roadian-ct8-hl***
Michelin Agilis Alpin is about the only other brand available in the US in the Euro C size
https://www.michelinman.com/upload/michelin_us/specifications/specs-agilis-alpin.pdfThe Agilis® Alpin® is designed specifically to fit the latest generation of European-style cargo vans, and provides both 3PMSF certification for winter usage, along with excellent wet/dry traction and wear resistance to allow continued running in the summer months.
The Agilis® Alpin® is designed specifically to fit the latest generation of European-style cargo vans providing excellent winter grip in cold weather without compromising wet/dry traction and wear resistance allowing year round usage.***
These three tires all have the 3195 lb rating at 83 psi, and have a load index and speed rating of 121/120R which is suitable to your MH.
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Not sold in the US market but available in Europe and Mexico is the Michelin Agilis Alpin Camper tire. Tread is designed for Motor Home use.
https://www.michelin.co.uk/tyres/michelin-agilis-camping#tab-tyres-benefits***
These Euro C tires are mandatory on the Ram Promaster as a standard LT doesn't have the weight rating necessary.
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Another alternative is to switch to a 17.5 inch rim and the much heavier tire that is used on it.
https://ricksontruckwheels.com/wheels-ford-e350450.phpCharles