Originally Posted by 8288WS
Your rims will probably be fine with higher tire pressure, but you could contact Forest River directly to confirm. Can't understand tire dealer not knowing.
Lets follow the trail of a basic tire earmarked for a large manufacturer of RV Trailers.
1st there is the tire manufacturer. They must determine the size rim every tire they make, has a proper rim size. That size is found on your trailer’s certification label and may look something like this; 15x5 or 16x6.5. That’s the sizes of the overall diameter of the rim and its width. Unless the tire manufacturer has mounted a tire to a rim they are not responsible for the rims load capacity or psi rating.
2nd is the trailer manufacturer. Even though they may not have mounted the tire to a rim they are still responsible for their actions and have certified the tire & rim combination to be appropriate for the fitment to the trailer. Providing them with the model/serial number of the trailer should be all they need to give an owner an answer about the rim’s load capacity and pressure rating if both are needed.
3rd is about the third party. RV Trailer manufacturer’s most often order rim and tire combinations already mounted and pressurized from a third party. That third party has to match tire maximum load capacity to a rim that will support the maximum load and inflation pressure of the tire. They should be the easiest ones to get that information from.
: The maximum inflation pressure allowed for mounting tires is 40 psi. The third party does not know what the recommended tire pressures will be so that’s all they will use. When the assembly is married to its destination on the trailer the installer must air the tire to the recommended inflation pressure found on the trailer’s certification label. If forgotten, the trailer may be moved around on the 40 psi until it’s shipped to a dealer. If the transporter doesn’t have tire pressures on his/her check list the trailer may travel in excess of 1000 miles severely under inflated causing damage to all of the tires. New owners sometimes have trailer tire failures on the way home with their new trailer’s in tow.