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RV trailer rim information is not easy to explain because most people have a perception that may only be partially true.
Determining rim specifications is the responsibility of the Society of Automotive Engineers (SAE).
The DOT directs tire manufacturers to provide a list of rims suitable for fitment to every tire they manufacturer and make that list available to the public. That basic description is something like; 16x6.5 etc.. It will be displayed on your trailer’s federal certification label along with the tire size fitted to it.
Rim load capacities and pressure ratings are not required to be displayed on individual rims. Because vehicle manufacturers may have more than one vehicle design for acceptable use of like sized rims the rim manufacturer will add load capacity, pressure capacity or both on those rims.
The DOT does require rim manufacturers to identify the rims they build. The rim builder must put their name, rim model/part number, and serial number on all rims they manufacturer. So, bottom line, when in doubt, contact the rim builder.
p.s. When ordering replacement rims make sure the seller understands that you want RV trailer rims at zero offset.
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