If you mean have I hiked the entire Santa Fe Trail, no I haven’t but I have been on many different parts of the trail. Also I have visited many fabulous Indian sites, both inhabited and abandoned in NM. I have never even seen a sign or marker or indication on a NM map about this stone.
My next trip to NM I am going to look this up!
If it's a boundary marker of some sort it's in the right place, and it's certainly unique (a necessity in later years when there is a need to find the various baselines).
If it's something a Mormon carved, then why did he stop with one? And, where are the other Spanish boundary and survey markers in the region? What do they look like?