As Kemo said do not strap your bike down using the handlebars. Use the top triple tree and you won't have bent bars or crushed isolators. J&P carries the soft ties.
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I have always liked pulling down on the bottom of the crash guard or Frame. Pulling my bike down and Into the 90* 5" channel on my trl...
I use nice white straps,,, the ratchets straps that my bike came from HD with..
I know a few nice HD managers and always get new straps every couple of years.
I like to also strap the rear down so it won't Jump or move side to side..
I NEVER use anything Open J Hook,,,, Heavy Climbing style screw lock hooks are what I use..
I have seen the J hooks come loose, bend open OR bounce Loose so solid is best for me.
I also place a center strip of Extra plywood on the floor of the trailer and it does save the floor after years of Bounce and Just plain weight pounding..
signed....BUBBIE