Originally Posted by Crasher
Does anyone have a trailer tire size 235X80/R16 that is "Made in America" ?
The answer to that is no.
So it boils down to what is the best answer and how good is the logic in the best answer? Only at a serious crunch time event will the answer be challenged. If challenged will the logic for the answer hold-up?
The regulations used by the vehicle manufacturer that built your trailer are enforceable. Tire industry standards will be used as a guiding standard equally throughout the tire industry. Enforceable in some circumstances of litigation actions.
It’s not about tire design. It’s about who makes the initial selection. That’s done by the vehicle manufacturer. They select the tire design, size and set the recommended tire inflation pressures in accordance with the regulations. Because trailer builder 1 uses xxx tires on their vehicles and they are very much like your vehicle does not indicate that it’s approved by your trailer’s builder, especially if their xxx tires are of another design.
The regulations trailer builders follow when building your tires are not applicable to the public at large, they are for builders of trailers, says so right on the FMVSS documents.
Even when plus sizing with replacements the design must be questioned because it is implied that it should be followed. It’s important to remember that tires are designed and built by tire experts. Tires used on our vehicles were all chosen and fitted by the vehicle experts. It’s a collaboration, “you build them and I’ll use them”. The regulating authority (DOT) gives exclusive privilege for selecting tires for vehicle fitments to the vehicle expert side of the collaboration and no others.
No matter how anyone may personally judge the regulating authority, their standards do level the playing field that provides the best safety available until proved otherwise. That - in my opinion - will determine the right or wrong of an event of misapplication.
Vehicle certification is a serious process. What the builder is doing with it is swearing that the vehicle and its safety equipment meets the minimum safety requirements set down by the regulating authority. The regulating authority agrees. The ball is rolling and all subsequent replacements must be equal to the tasks or better than the original as determined by the vehicle manufacturer or, in this situation, with an approval from the TRA for standardized charts and sizes for the automotive side of the house. I’m not aware of any TRA approved replacement recommendations for RV trailers or any other trailers built to FMVSS.
I own a RV trailer. This is what my owner’s manual says.
To maintain tire safety, purchase new tires that are the same size as the vehicle’s original tires or another size recommended by the manufacturer. Look at the tire information placard, the owner’s manual, or the sidewall of the tire you are replacing to find this information. If you have any doubt about the correct size to choose, consult with the tire dealer.”
Tire industry standard
: “ The replacement tire must have a maximum load carrying capacity equal to or greater than the maximum load carrying capacity of the original equipment tire.”
The correct inflation pressure for your tires is what the vehicle manufacturer has said it is with the tire placard and in the owner’s manual. If you want to do something different, go up, but never down. The maximum load capacity of a tire is what the tire manufacturer says it is and they put it right on the sidewall for all to see. Oh, “rumor has it that brand xxx and size xxx is stronger than what is on the side wall.” That’s a rumor
unless you can get the builder to say otherwise.
The question is not about what replacement you use. In a lot of cases any design may qualify in the load capacity category. Will your replacements meet the approval of the trailer manufacturer? Will the tire manufacturer warranty it for your application? Because a tire manufacturer classifies tire xxx as “all position” does not, in itself, qualify it as a trailer tire. Will the vehicle manufacturer approve it? I’ve seen fancy fifth wheel trailers delivered with 20” passenger tires. To that manufacturer those were appropriate for that trailer.