New regs won't let them plug tires. A repair patch/plug from the inside is the only way to go. If it in the sidewall or outside the belt in a flex are it will not hold. If it is a high pressure RV tire absolutely no way even to get it to a repair facility. It will shoot it out in short order. I have a plug repair kit from many years ago. It will do, for me, until I can get it to someplace, for proper patch, in a regular passenger car tire but.... my truck cars, and rv all use higher pressure tires. The little black car is 38 lbs to 40 lbs. the truck is 45 and some tires are as high as 80 for the pick up. The Edge is 45.
Don't depend on a plug.