I initially fitted the 150mm pole carrier under the rear bumper,but found it was too low in some situations.I then got some 3mm aluminium plate and bolted this to the top of the rear bumper ( this size 150mm pipe does not cover the rego plate ),I also made a smaller plate for added support/strength to the 3mm plate when I tightened the bolts on,see pics.
Rear bolt fitted to bumper Front fitting fitted to rear bumper bar on Expanda 16.49-3 Side view
Rear bolt fitted to bumper Front fitting fitted to rear bumper bar on Expanda 16.49-3 Side view