Camping on mudstone country last week. Very dry hard stuff the ridges. I carry both Al tubes and Ti stakes, with the tubes used at the ends of the tunnel tent under significant load. Several times I had to resort to the Ti wires at the ends because I simply could NOT get the tubes in, even with hammering. With the Ti wires – I just kept hammering until they went in.
Funny thing tho’ – in one case once I got the Ti wire through the rock (some hammering), I was able to replace it with a tube. The Ti wire had fracture the rock.
Cheers