One of the misconceptions that seems to scare people away from welding on sliders is that our frames are heat-treated and will be weakened by the welding process. My understanding is that some vehicle frames (such as semi's) do undergo a heat-treating process; but passenger vehicles such as our 'Zus are just regular steel with no special processes.

What I know for sure is that my sliders have been welded on for 4 years now and I have beat the living daylights out of them dozens of times with no apparent damage to the frame. The 'tube within a tube' removable mounting is a cool idea; and one of the MWIOR gang is considering this with his sliders as well. Just make sure you extend the frame-mounted part out far enough to effectively sleeve the removable part of the slider.