Stretchman

I know they make these for the body lift kits, and I was wondering if they are any good? Are they safe to use? I actually am thinking about using them for an Oly 500 rock bumper. I have heard and seen that it sits a little low. I like the bumpers because they are lightweight and can take the stock stuff.

Smittybilt also make a frame cover that is made for tube bumpers. Has anyone ever used one of those, and do you think it might work for the rock bumper?

TIA in advance for any info.