Heavy dental clinic trailers are still being towed between schools, even after an investigation found their wheel studs are likely to snap off after just 3000 kilometres
The wheels on two trailers have already failed, sending the wheels flying across the road.
The investigating engineer calls it "really scary" how much stress goes on them in corners.
One Tauranga company is even refusing to move them anymore.
Phil Pennington has been investigating this for six months.
