All Roofnests attach to crossbars using 8 M8 nuts. One option is to use what are called security nuts instead of the included standard nuts. These security nuts require a special tool to tighten and loosen.
You would need:
We will say, out of thousands of tents, we have heard of no thefts! Typically it is just not an item that looks too appealing to a thief. Also, in our opinion a thief isn't very likely to sit there with a wrench in the first place and any sort of security device like this can be quickly removed with a saw.
If you are still unsure how these might work, take a peak at our installation instructions.