Remember, The B has an aluminum frame. So don't ratchet it down like you do lighter bikes. It can ride on its own suspension. Just strap it with side to side tension. You want to keep it straight up. Let it bounce on the shocks. It won't move much like your on the road. The trailer suspension will take up some of the road shock. Strap the tires at the bottom and as high as you can without hitting anything. Hard to do on the back tire.
It scared me to haul it without pulling it down hard but worked good. You can strap it downward slightly, to help keep it in the trailer in case of an emergency. Main thing is let it ride on its own.
A good wheel chock is a must.