I am comfortable using plugs in my ATV tires, where the pressure is 6 psi and I am off road when I get the flat. I can fix it myself.
I have used plugs on my trucks for decades with no problems. Even though I know it is not the approved method.
When it comes to towing, risks are higher and the consequences are higher, so I would insist on the RMA approved repair method.
At 4 years old, I would start looking to replace the tires before next season. I had a blow out in year 4 of my TM tires.
I will be replacing my truck tires soon, even though they only have 16,000 miles on them. They are now 3 years old.
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