When I hauled mine, I used 3 ratcheting ribbon tie downs - rated for 700 lbs.
One for each front wheel and one for the back.
Besides feeding it through the wheel spokes, I wrapped it around the wheel and hooked it on the other side. So the wheel and rim where in a loop. Snugging it up took more care, but when it was done, the Spyder did not budge an inch side to side or forward or back for over 500 miles.
Of course, set the parking brake before you tie it down.
Take it easy for the first 10 to 20 miles or so, then stop and check the tie downs. Mine were new and needed to be snugged up again, but were fine for the rest of the trip.
On the trailer I had, the tie down anchors were about a foot and a half to two feet in front of the front tires and behind the rear tire, so there was tension pulling it forward and backward. With the parking brake off, three of us could not budge it forward or back.
I had chocks, like Scotty mentioned, but since it was a rented trailer and the Spyder was stable, I didn't screw them into the bed and use them.
If you need pics, let me know and I will post some.
Tom