I never seem to get it on the path. Can anyone help me? I scaled the triangle before the pattern along path, when I don't change the dimensions of the triangle the pattern along path goes perfectly but I don't want an equilateral triangle.
I'm not sure where you are going wrong to be honest.
Anyway this is for the latest Inkscape 1.0. I'm going to do it using the new Path Effect named Pattern Along a Path
Basically I drew a triangle, and copied it
Selected the path I want to attach it to
Applied the Pattern Along a Path effect, chose Link Path to Clipboard, and set it to Repeated and that's it.