Dumper doesn't calculate mass properly

[assaultdoor]

Using MML 0.47.4 on OS X with Java build 1.8.0_51-b16, Dumper items don't use the mass of cargo in bays (under the Transport section on the Structure/Armor tab for combat vehicles or the Transport tab for support vehicles) to calculate their own mass. There is a different problem when calculating their mass using Cargo equipment item (added under Equipment tab). (I'm capitalizing Cargo when I'm using it as a piece of equipment.)

As long as I have Cargo equipment items that do not have assigned locations, every dumper on the unit will use the combined masse of all Cargo items for its own mass. However, once I assign a Cargo item to a location, its mass is not used to calculate the mass of any dumper. I can't find a way to assign a Cargo item to a dumper, or a dumper item to a Cargo.

Examples:

Case 1: Cargo assigned through Transport

Create a vehicle with 10 tons of regular cargo under Transport.

Add a dumper item to the vehicle and assign it a location.

There is no way to assign the 10 tons of cargo to that dumper, so its mass remains 0.

Case 2: Cargo assigned through a Cargo item.

Create a vehicle with four dumpers, one for each direction, and assign them locations. Each should have a mass of 0.

Add one 10-ton Cargo item. Do not assign it a location. Each dumper has a mass of 0.5, or 5% of the total unassigned cargo mass. This is incorrect, since that mass hasn't been assigned to any of those Dumpers yet.

Now assign that Cargo to a location. All dumpers now have a mass of 0, which is probably reasonable since that mass still hasn't been assigned to any of them. However, there doesn't seem to be a way to assign it to them.