Boot racks "….better for the bikes (being out of the weather at speeds) and more secure."
I fail to understand the reasoning behind this, especially the more secure aspect 😕
I feel much happier with my bike on the roof than the boot rack.
Greater fuel consumption is obviously one aspect against roof racks, but boot racks must have some impact on MPG, and unless you are covering great distances I would have thought the difference between the two was negligable.
Mind you, getting the bike on the roofrack after recovering from a frozen shoulder was a bit worrying for a while.