Originally Posted by Aspenmeadow
Tireman9, I was referring to just the tire pressure issue that should be the concern of NHTSA since surveys have shown most RVs are below safe pressure standards or overloaded.
The rest of it still stands that the dealers appear to be sales only. The service with other units I have owned has been uninformed and bad, with the exception of a Canadian manufacturer, ESCAPE TRAILERS that sell direct with no dealer networks. Escape was terrific.
OK. RE pressure.
NHTSA is concerned with tires meeting the regulations. It is the RV MFG responsibility to specify tire inflation that will support or exceed the expected / stated max load on the axle.
The problems arise when the assumption is made of an exact 50/50 side to side load split and the tendency of RV companies to select the lowest cost option (smallest, lowest cost) that barely meets the minimum requirements).
The 61 psi is a bit odd as most tires designed in the US are to TRA standards which publish load/inflation tables in 5 psi increments. The European or Asian standards while similar use Kpa which can end up with odd psi numbers when doing the conversion.
RV owners can confirm the minimum inflation needed for their tires by learning the actual load on each end of each axle, then consulting Load/Inflation tables to learn the MINIMUM inflation required. I suggest the cold inflation be set to at least 10% above the minimum needed to avoid the necessity of adding one or 2 psi when the Ambient temperature changes.
There is a lot of supporting and background information in the over 225 posts on tires, TPMS, valves and related information in my blog. The blog does have display advertising, but the income goes to the blog owner not me. I am only the contributor. I sell nothing and receive no commission.