Strap it around the headstock taking care not to trap any cables,then as weeksy suggests the pillion pegs or through the frame. Dont strap your brake lever you can do that with a bit of string seperately.
One thing you might need is something to put beneath the sidestand,when I brought my bike up here,350 miles, earlier this year I found my sidestand had gone through the plywood floor of the transit and it was only the tension of the straps stopped it from falling over.
