Originally Posted by Oaklevel
Just askin' so why won't tire dealer's install LTs on trailers. They will not in this area anyway.
Please don’t take this as a harsh answer. It’s just based on facts that people don’t like to accept.
For a long time know I’ve been doing the safety side of tires. I’ve been branded all kinds of bad and have even been banned from tire threads - sometimes - because of my harsh postings.
Tire dealers cannot over ride, trump, or any other way, do less than the vehicle manufacturer. Because? The vehicle manufacturer, in the eyes of the governing body (DOT) has sole authority for Original Equipment tire and rim fitments. They are required to put their (MINIMUM) selections along with recommended tire inflation pressures for them on the federal certification label and display it on your trailer.
Tire industry standards (aftermarket) consist of a set of standards from tire manufacturers, the Tire & Rim Association (TRA) and Rubber Manufacturers Association) RMA. They are very consistent and found in any tire manufacturer’s Standard Operating Procedures (SOP) manuals and PDF files found on the internet.
For a tire dealer or any other tire shop to change your trailer tires from one design to another is considered a misapplication. In fact, any change not recommended by your trailer manufacturer in the Owner’s Manual for your particular trailer is a misapplication. RV trailer tires do not have the same industry standards as the automotive industry with their pre-selected replacement lists and approved “plus sizing” procedures.
Why a trailer manufacturer selects and installs the tires on your trailer is immaterial. It was their decision to make within the guidelines provided by the governing body (DOT). None of the designs such as Passenger (P), Light Truck (LT), Special Trailer (ST), Hybrid - ties with a LT prefix marked “for trailer service only” or any of the wide range of medium to heavy duty truck/trailer tires are exempt. But, no matter what their design they are all installed in accordance with FMVSS guidelines. Not to be confused with guidelines for the trucking industry.
The bottom line. Once your drive off with your new or used trailer, it’s yours to do with as you see fit. I encourage you to be safe with everything including your tire selections. Below is a version of minimum industry standards. It’s from Michelin - hard to find them admitting they don’t control everything.
(Click on the tab "changing sizes or specs").