Runway state decodes - these weren't in the book..

[LYKA]

Whilst were on the subject of runway states, can any body help with this?

I am looking for the limitations of the various measureing vehicles. e.g. limitations of the skiddometer H + L, SFH, GRT, JBD TAP etc.

Also how does one find out which airports use which (apart from in the snowtam)

cheers