If you performed a set-up in the print window, the information is not stored for later print jobs. If you want to set the default paper tray, you need to configure the LaserWriter 8.1.1 in the chooser.
To select the default paper tray:
1) Open the chooser and select the LaserWriter 8.1.1. driver
2) Click SETUP
3) Click Configure
3) Select 250/500 Installed and Preferred.
Once the printer software is configured, the printer uses the paper tray you selected.