Side Wall punctures on tubeless tires

A few weeks ago I stuck two pieces of electric fence wire in the side wall on one of the rear ties on my newest Scag Tigercat. It was mid afternoon on Friday and I did not have any plugs on the truck so I took it to the nearest tire shop. The guy at the tire shop told me that they could not plug a side wall puncture and I would have to put a tube in it. He did not have a tube. I load it back up and went to the next town to a tire shop. He also told me that a lug would not work on a side wall puncture.

We put a tube in it. Last week we were in a small town about 25 miles away and the tire went flat. Using my 2 gallon 110 volt air compressor and 2 cycle cheese generator I was able to get enough air into it to load he mower into the trailer. We finished the yard with one mower and came back to the tire store that had put the tube in. I asked him again about plugging it. He again told me that a side wall puncture could not be plugged. I finally talked him into putting a tubeless valve stem back in it and plugging the two holes in the sidewall. It is still holding the right pressure. We punctured e side wall on the other tire last Monday and plugged it in the yard and airs it back up. Both are holding air now.

Have any of you ever experienced a side wall hole and plugged it with satisfactory results?