As has been said...thickness of the MLK rain/rime crust is highly variable.  Below about 9,500 feet, the crust was pretty thin, usually 1/2 an inch to an inch, and underlain by very weak facets. Didn't like the structure at all until about 9,500 feet when the crust became quite stout, up to 4 inches thick in places (at similar elevations in Mill B the crust was about 2 inches and I think the extra stoutness in the gut of Bonkers could be due to rain on what was likely a bed surface there).  Crust remained stout up to about 10,000 feet, where it again became thin, generally about an inch, and underlain by weaker facets.  In this "band" between approximately 9,500 - 10,000 feet not only was the crust stout, but the snow underneath was generally starting to round and was often finger hardness. 

Looked into upper Stairs, as we had been hopeful that the crust would be stout there due to the NW exposure. However, snowpack in Stairs at around 10,000' was pretty terrible, with the 4 inches of new snow on top of a 1/2 inch barely supportable crust underlain by over a foot of large facets (fist hardness here).  Down Bonkers instead then into Mill B.

In MIll B, noticed a similar pattern to the crust facet combo.  Upper elevations (below 10K here) had an approximately 2 inch crust, then as you descended the crust got thinner and the underlying facets weaker.  Saving grace in a lot of areas with a thinner crust is that these areas don't have much of a slab (upper elevations wind scoured...lower elevations received less).  Sort of a scary in between area where there is about a foot and half of snow...and the crust is weak. 

Current forecast of a low with pockets of considerable seems to do an ok job of describing the problem.  Sort of a low, "unless its not."  Takes a lot of work to really keep an eye on the crust/facet combo and the problem is, if you are covering  a decent amount of ground, you are just going to cross somewhere where the structure is bad.  Some areas, like upper Stairs, won't take much of a load to become active.