Get ready for the different opinions!

If I'm going to a local regatta that's within a 2 hour drive, I usually leave my rigging attached and coil it on the trampoline. With the mast down and it slid in place on the trailer, the mast hound is usually around the rear beam. I start there on either the port or starboard side - one side will have the forestay. I make a loop in one direction and then make a loop on the other side of the loop you just made. You'll have to alternate sides you coil since the cable will not want to twist (I know this sounds weird...but try it and it will make sense). Once I have most of it coiled about as far as I can go, I lay it on the trampoline under the hiking strap and use twice the number of bunji's I need to hold it in place (in case something breaks). Same goes for the other side.

If I'm trailering to somewhere beyond 2 hours, I remove the stays and trap lines from the mast and coil them separately while securing the coils with electrical tape so I don't have a nasty snarl to undo when I get to wherever I'm going.