And if an A/C slides off the R/W, it will do wonders for the landing rate! Appreciate the difficulties in busy periods, but agree an "Unofficial Ob." is fine for starters.
Official Ob. could then be done on an on/off basis, between movements. GripTester, or mumeter not required just to give damp/wet/flooded etc. Stick it on the ATIS, job done.