The incident happened on the Circular Road in Letterkenny shortly after 7am.
The trailer-style contraption, pictured, was in the centre of the road close to a roundabout.
Three youths were seen running away from the scene shortly afterwards, an eye-witness told donegaldaily.com.
Gardai are investigating the incident and moved the trailer back to the side of the road.
Meanwhile some parts of Co Donegal had a light dusting of snow and sleet overnight.
Temperatures have dropped this weekend and Gardai are warning motorists to be careful on the roads, particularly in rural areas.
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