Selling Trailer In Ontario I Accidentally Hit This Car Trailing A Boat, At About 5 Kph. The Motor Fell Off.?

I accidentally hit this car trailing a boat, at about 5 kph. the motor fell off.? - selling trailer in ontario

Accidentally, I hit the car behind a boat, about 5 miles per hour. to leave the machine.
The trailer was not damaged, was not injured, the ship aswekk (except the engine (an old 15 hp)

I immediately knew I had to buy a new one, although I think he may try to me that more is that I sell damaged. Additionally, NTS is the developer of the back of the trailer, in Ontario, and only a red cloth or flag at the end is the end of the trailer to give the bast
In addition, the trailer is not registered.

Help? Leagally jhave I pay for the new engine?