This is something many do not consider, as most family's have no idea what the equipment is worth or where to sell it.
I'm going through this now helping a friends wife sell off his equipment, records, and odds and ends after his sudden passing. its a big pain in the you know what, fortunately my friend was at the OCD level for keeping box's paperwork etc. that helps immensely. Also communication to your family before you die is very important specially if there are specifics to an item like a custom made item.
Do some work to organize things while your alive to help your family move on and not lose their shirts selling your gear, music collections and all the small stuff like wires, set up items, etc, etc. The small items are the things that end up in the trash as they are hard to sell, so have a plan.