I've just acquired a 2006 Tundra with the factory bed liner. I've seen several posts about using 2x4, 2x6, etc for installing fork mounts. I see how the mounting beam would not move either to the front or back, but how do you avoid it bouncing up and out? Further, should you use pressure-treated lumber? Is anyone willing to share pics of thier installation (I'm much more of a visual guy). This just seems like the best (easiest) way to go. My old roof-mounted Thules seem like a distant happy memory now, but spring fever has me itching to get back up to the mountains! Any ideas or thoughts would be appreciated.