I assume you are manually loading cars in surveyor. I had no trouble loading the built-in BNSF flatcar with both of these commodities. The new dialog is a bit different than the old one. In most cases, when a piece of rolling stock is configured to carry commodities, you just click the free standing Add button on the left under the Commodity Levels heading and choose the commodity you want from the drop down. Then move the slider to fully load the car. The slider replaces the popup message that asked for the amount of the load.
Beneath that section is a twist down that starts with Supports and a list of commodities. Clicking on the triangle shows the round dots symbols of the commodities the rolling stock supports. This resembles the old method of loading a car, where you pick a symbol and then add the load amount in a popup message. That has been replaced by the method above. Now the only use for this area is to add a new commodity or to change the way a commodity loads when chosen with the method in the first paragraph.
