I had a pair of sliders made from "Blackfoot Customs". I believe his website is in his myspace or something, but if you want I can get you his Email. The sliders are at a great price, 350 plus 80 shipping. The guy is super nice with excellent customer service. When I got the sliders they seemed pretty stout. I have yet to mount and use them but had a couple of complaints. The mounting brackets weren't pre-drilled and seemed pretty small to drill a couple big holes through, oh yeah they are frame mounted, the outriggers are c-channel and only welded on one side. This looks weak to me, but I don't know yet. He says it has held up fine and the reason for the lack of a weld all around is because he didn't want to weaken the metal? Not a welder so I am not too sure about that statement. Anyway I have a couple of pics.
*Thought I had more pics. If you want more let me know.