Securing cargo cases on roofrack?

Hi mates.

Hopefully some of you know what I'm referring to but if you don't I have acquired two rhino cargo cases as seen here;


I am wondering if anyone else uses these and stores them on the roofrack of their vehicle??
Whilst mine won't be overly heavy with stuff inside they are a bit too bulky for in the back of the patrol. I've put one up on the roof rack and it slides around very easily so I'll need a good securing method.

They are 600wide x 550 deep x 400 high. I haven't put both up together yet but I'm hoping they will be a tight fit side by side right at the back which would stop side to side movement.

If that fails one idea I had was to use a ratchet type strap on each handle down to the roofrack therefore eliminating it sliding around. I could also put those cheap foam mats underneath each box to stop it from wanting to slide.

I'd love it if someone had some pics with this gear on the roof. I know pelican also make a similar box and probably many other brands as well.

Thanks for any ideas/help folks.