"Canyon Dancer" on the handle bars......Ratchet straps with the suspension compressed about 40-50%.....Wheel chock if you have one.
You don't want the front wheel "washing out" (side to side). It must be secured to the floor of the trailer in some fashion either with a motorcycle tire chock or a couple pieces of wood screwed into the trailer floor on each side or two straps, one on each side holding it in place.
Be sure the ends of the tie-downs are secured with wire-ties or some other method. I've see bike wrecked because the trailer hits a bump and the hooks become detached.
Bike needs at least four straps. And they need to be pulling from an angle. Looking down on the bike...at 2 O'clock, 4 O'clock, 8 O'clock and 10 O'clock. This stops the bike from falling over AND from moving front to back.
I like and trust ratchet straps better than simple cinch straps. Buy good ones. The extra cost over the Horrible Freight or Wally World will pale in comparison to what a bike going bad can do to itself AND the interior of your Toy Hauler.
If you have extra straps, use them! I like LOTS of straps... :-)
I've hauled hundreds of racing motorcycles over the years. Haven't lost one yet!