I've got four quick-release gutter mounts that I can bolt to crossmembers. The manufacturer intended them to bolt to 2x4s for a quick/cheap roof rack, but I was thinking of something less likely to rot! Should I just use some steel square channel and paint the bajeesus out of it when I'm done with all the drilling (crossmember bolts, eyebolts for tiedowns, etc.), or is there something better out there? Is there stainless steel square channel available? Chrome? Endcaps? Eventually, I want to bolt a basket on, too, but just need the crossmembers right now.