I owned 24-5N for over a decade, I really liked that I could take it so many places.
You only need "drag chains" in rare conditions, IMO you would be wasting your money. If conditions are so bad that drag-chains are required, it's best to stay parked for a day or two and let conditions improve.
You also really don't need M&S's either. You aren't applying any torque to those tires. That is where they really shine. Check with commercial trailer folk, they don't put M&S (or snow) on trailers, even in Alaska and Canada.
As for sourcing Discount Tire get's my endorsement.
As for Don's slam on ST tires, let's just say that his opinion is not supported by the facts. Yes you can buy really cheap Chinese made ST, and a lot of RV builders do. But you can also find good (more expensive) ST tires.
Here is why you should buy good ST tires
The construction, design, materials and testing used in ST Special Trailer tires meet the higher load requirements, duty cycles and special demands of trailering.
* Polyester cords in an ST tire are bigger than in a comparable P or LT tire.
* Steel cords used in ST tires have a larger diameter and greater tensile strength to meet additional load requirements.
* ST tire rubber compounds contain chemicals to resist weather and ozone cracking, particularly conditions resulting from extended storage and the unusual duty cycles of trailer tires.
* The slightly shallower tread depth of a trailer tire reduces sway and rides cooler, which adds to tire longevity.
* ST tires feature stiffer sidewalls, especially in the lower section which:
– Reduces sidewall flexing causing the trailer to track straighter. – Diminishes the risk of trailer sway.
– Lessens the risk of sidewall puncture and blowout.
* ST tires generally offer approximately 10% percent more load
capacity than a similar LT tire and nearly 40% more than a P passenger tire.