Legalities of an H frame

the actual H frame on the front won't effect the air bag problem as long as it's not attached to the roof racks via a brace. As the bullbar collapses the H frame or T bat will just push back with the bar.
Ensure that the frame sits inside the bullbar as it does FAIL the australian design rules if it's on the outside.
My vehicle has been fitted with them and insurance has not been an issue for us.
Contact your insurance to get them included in your policy and that way you are covered.

Anything in the drivers view needs to be less than 30mm in diameter. So H frame material cant be bigger than that.

Yes. It is what guides the placement of the auto tuning bases on HF sets in most cases.

We have a hilux dual cab with a canopy and have carried kayaks (4.5m long) a number of times. I'm not sure how high your canopy is compared to the cab.

We used roof racks and Thule Kayak carriers (hull-a-port). These hold the kayaks side on and are much easier to load than the carriers we had before which held the kayaks flat. The hull of the kayaks sit well above the canopy.

Perhaps this provides another option.

Hi dave,

I have exactly the same as mikeyandmary, the thule roof racks sit about 11cm? above the roof, and sitting the kayaks sideways in the cradles might be enough to get the rear taper of your kayak over the top of your high canopy.

cheers
richopesto