Its a problem, not just in metalworking - my interest is in amateur radio and electronics, have a shed full of gear (radios, test equipment
- and now the start of metalworking stuff as well.....)
What seems to work here is that someone, of high repute, in the local (insert interest group here) club seems to be the nominated person to dispose of gear. It helps if they have storage space themsleves, and are willing to hold until a good price comes along. Familiarity with value is important too (obviously)
BIg metal crunching machines - logistic problems for sure, and it may be a case of reduced price to get them out of the place. (Radio/electronics gear is "usually" smaller and easier to move....)
What is nasty, and I have seen it, is "Someone" turns up after the funeral, claims to be a good friend of the deceased, and says that will take care of it for the widow. Term for them is scum......
All I can suggest is you make up a list, with suggested value, put it in an envelope. Tell your spuse WHO you want to do the dealing, and preferably someone she has met so there is some trust already in place. As suggested, photos are also a good idea - and list accessories as well.
Andrew VK3BFA.