I been seriously thinking about these past few comments.
Take a bike weighing ?150 + kgs (thats roughly how much mine weighs, HDs etc gonna be more) in the event of a front impact i cant see any amount of lashing to rear tiedowns is going to stop that bad boy flying forwards and seriously injuring the front occupants ?
I have removed and refitted the lashing points in my van and its just a bolt screwed into a hole, they dont even go through that far
Low speeds would obviously be fine but i honestly dont think i would travel at motorway speeds with a large metal lump like that behind me