With the third option crossbars with side rails you can secure an item to the side rails and run tie downs from front to back securing them to the crossbars.
How to use tie downs straps on roof racks.
Make sure the straps are tight and secure and as with the hard roof rack make sure you tie up the loose ends of the straps.
Toss the strap over the canoe and thread it beneath the crossbar s opposite side.
On each side of the roof you ll see a rack that runs the length of the roof of the vehicle.
Use a tie down that wraps around the item and the rails.
First loop the strap under the roof rack s crossbar and drape the loose ends over your oblong load i e.
Next pull the long end of the strap under the crossbar on the.
Roof racks have been known to fail at high speeds with lots of updraft so take the extra precaution of tying the roof rack down to the roof of the vehicle as well.
Follow the steps for the hard roof rack but instead of securing the straps to your crossbars you will usually have loops on your soft roof rack where you can loop the cam straps through.
Secure using the cam buckles.