Sealing tubeless trailer tyre punctures: Modern tubeless trailer tyres are relatively resistant to punctures, particularly when new, but that still does not prevent them from getting holed. This commonly happens just when the trailer in question is part of a vital feed, silage or corn cart logistics train. Thankfully, most agricultural punctures can be sealed without even removing the trailer wheel. James de Havilland studies the ‘plug in’ theory, using an implement tyre as his deflated subject