I remember when sliders were something you made yourself or had made by some one eyed hillbilly who took payment in cases of Natty Light and/or 22LR.
In the end they're a beefy metal tube and it's really hard to **** up something so damn simple or introduce some incredible advancements in tubes that stick out the side of your truck.
With that said, attachment is key, and you really are better off welding them to the frame than bolting... these things technically can have most if not all the weight of your vehicle on them.