We keep ours tied all the time...
Cut the main sheet so that with a knot on the end it goes out the full length of the beam. Then just tie the beam tail and the block tails together. Makes it for easy up and down and helps to keep the traveler in place while on the trailer.
Totally agree with Joanna. Doing it any other way would be a pain in the butt and eventually destroy your traveller car.
