Strapping Oztent To Roof Racks

Mate, I use those strap/buckle things you hate.

Mine are lockable, contain a rib of multi-stranded wire down each side and the buckles are coated in some type of rubber.

I am quite comfortable to pull up in any town and leave the vehicle unattended, knowing that it is extremely difficult to cut through the straps.

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I use the Ockey straps but the better quality ones, I typically tie up the Oztent and the Self Inflatable matress together, I also have the Rhino rod holder accessories which also act as a good anchor on one side. Depends on what rack arrangement you have, don;t get too stressed about the roof on the Hilux.

I've never been fully happy with any tie-down that I've used.

However, I saw some the other day that held promise for your application.
They were moulded from colourful material like silicon rubber. They were about 40mm wide with a series of holes along the length and an arrow-head end.

In use, the arrow-head is looped around and pushed through a hole to fasten. Straps can be connected in series to extend the length.

The advantages are no metal and no hooks.
Try camping stores or 4wd stores.

I've also shared your concern about the safety of occy straps. Too easy to lose an eye by those runaway metal bits on the end of a very elastic cord. But manufacturers are gradually getting it better.

Best I've found are the 1" wide flat straps made by ROK. Buy them in various lengths from some camping stores or Big W. What's different??? Well the strap has limited elasticity - so it holds the load firmly and takes up the slack to keep things tight, but if you let go of one, it doesn't appear to me to recoil dangerously. Secondly, the end is not just a hook - you can loop the strap through itself, so it can't let go. I've used them for about 2 years now. Here's a photo:

I looked at these for securing a kayak.

They may be useful...

You could try 50mm webbing with plastic buckles. They won't scratch the roof/car.

I use these .

I use the "Andy Strapz". They are a flat, wide strap with velcro on the ends. Bought them from ARB a few years ago, never had any issue with them.
Regards
Peterflat strapz