Hey I read a post a while back concerning roof racks and how to mount them. I made my own rack for my 88 burb. In the process I went to a local fastener shop and found something called a well nut. I got the rubber ones. They seem to seal up well and reduce vibration. Install is super simple. You drill a hole, drop the well nut in. Then align the hole is your rack with the well nuts. I used stainless bolts with some RTV on the threads. When you tighten the bolts the rubber expands and sucks up to the roof of your truck. Mine has held up wonderfully over the last 4 months. If you have any questions feel free to ask. I can get pics if you like.