I think set of products that need to be made are loads that can be purchased without having to be from a piece of rolling stock. Here some suggestions for some load packs that Bachmann could release.
For 7 Plank Wagons:
Ore Loads (Like the ones from that Thomas set)
Gravel Loads (They would be a repaint of the coal load)
Crates covered with a tarpaulins
Rock Loads
Scrap Loads (So they can be used for the Sodor Scrap Wagon)
Uncovered crate loads
Milk Churns
Hay with Tarpaulins
Rubbish Loads
Parcel Loads
For 5 Plank Wagons:
Coal Loads along with the other loads I suggested for the 7 Plank Wagons, but they would all have to new sculpts since the 5 Plank Wagon tooling like the one used for Troublesome Truck 4 is skinnier than the 7 Plank Wagon tooling
For the Flatbed:
Steel Girders
The Chinese Dragon
Crates
Pipes
Paint Drums (That would be a good way to reintroduce the loads)
For 7 Plank Wagons:
Ore Loads (Like the ones from that Thomas set)
Gravel Loads (They would be a repaint of the coal load)
Crates covered with a tarpaulins
Rock Loads
Scrap Loads (So they can be used for the Sodor Scrap Wagon)
Uncovered crate loads
Milk Churns
Hay with Tarpaulins
Rubbish Loads
Parcel Loads
For 5 Plank Wagons:
Coal Loads along with the other loads I suggested for the 7 Plank Wagons, but they would all have to new sculpts since the 5 Plank Wagon tooling like the one used for Troublesome Truck 4 is skinnier than the 7 Plank Wagon tooling
For the Flatbed:
Steel Girders
The Chinese Dragon
Crates
Pipes
Paint Drums (That would be a good way to reintroduce the loads)