If you're comparing Estate Cleanout Dumpster Rental to a standard dumpster rental, start here. It is clearing a family property to a legal timetable, at a pace set by people rather than machinery. Bring this up yourself if the hauler doesn't: value leaves the house permanently once it is in the box, so sorting has to come first.
Picture the container two ways: full to the rim, or full to the ton limit. Dense debris hits the second ceiling long before it reaches the first. Executors and families typically place this order, and because the debris type is already known before pickup, the container settles into the 20 or 30 yard range without much back-and-forth. Have an answer ready for two things: how long the container sits on the property, and whether the load includes anything that isn't allowed in it.
Couches, mattresses and cardboard fill a container fast by size alone, while the scale barely notices they're in there. Ask what happens if the load ends up higher than the fill line: some haulers charge a flat overfill fee, others refuse pickup until the excess comes off. A container that's half-empty and a container that's overflowing are the same failure: the wrong size was ordered. Give the real numbers and avoid either one.