Hey everyone! I know, it's another rock slider topic... I'm wondering which sliders mount to the frame (like the Tactical 4x4 ones), and which mount to the sill. Seems as though most are sill-mounted, but wouldn't frame-mounted be better for true off-roading? I live in the mountains of Colorado, and frequently travel to Moab, UT so I'm trying to find a set that will provide true protection on the trail, not just from shopping carts!

So far, I'm interested in the following brands:

Tactical 4x4
Prospeed
Rocky Road Outfitters

Any others out there I should be considering? If anyone has any experience with any of these, your insight would be much appreciated!

Thanks!