I want to get some of these type traction slabs, but I'll probably get a generic to save some money. I was trying to figure out how to mount them to my Previa All-Trac. Something just ocurred to me. I have a roof rack and some cheap kayak attachments. I almost wonder if they'd just sit in those. I could just strap them up. Hmmmm, I might have to find someone that has some so I can see if that'll work.