I actually got a pretty huge nail in my left rear tire a few weeks ago while dropping of a friend. Fortunately his father works a lot on cars and had some plugs handy, so we used that since my tire had been leaking for over an hour+the drive to his house. PSI had dropped to 14.
He'd plugged up many vehicles, both his own and ones for the police department he works for, and over the years, he's only had one plug fail. Since my tires has almost no tread left, it seemed alright to plug, and so far, it's worked pretty great, even through a lot of hard driving.
I wouldn't use a plug if you're going to be using those tires for over a month though. A patch would give better peace of mind too. FWIW, my other rear also got nailed a year ago and I took it to a shop to patch. It hasn't had any problems since.
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