G`day Ski Freak and Overland Hadley
Yes and no - it does depend on the wheel base for Aus, USA DOT does not use the 60% rule.
There are a number of ways that bikes have been fitted, the picture is off the shelf bike carrier (US EarthCruiser) not the most compact. We have another EC in build now that the bike will be tucked up very close with a custom carrier.
On a side note about the ADR on the 60 % rule - should it apply to removable items - an example was brought forward by the fellas with bricks trucks that used site fork lifts. They had a strong argument that the lift truck should not be counted in the 60% calculation because the it was not always there , only at certain time for on site unloading. If my memory serves the states (In Aus) had different rules .... .