If your rear axle is at or over the max weight, consider using one of these tires,
There is a new tire out there (I'll refer to it as the Euro C). it is designed for cargo vans.
The Continental version is called the Vanco Four Season. 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.
https://www.tirerack.com/tires/tires.jsp?tireMake=Continental&tireModel=VancoFourSeason***
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/miche........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.
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These three tires (in the 225/75R15C size) all have the 3195 lb rating at 83 psi (single) and 3085 lb (dual installation), and have a load index and speed rating of 121/120R which is suitable to your MH.
To compare, the standard LT225/5R16E tire you are probably using now, has a single wheel rating of 2680 lbs and a dual wheel rating of 2470 lbs (at 80 psi inflation)
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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