Avoiding trailer and bumper collision when reversing

[steady eddie]

In answer to the original question the length of the drawbar plus the width of the trailer or caravan and towing vehicle will determine the angle. Always remember the more you wind on the more you have to wind off, if you go too far without correcting the turn it won't be recoverable. A lot of time where you start the manoeuvre from makes a big difference to the end result.