You can read about setting up applications for displaying in trades here. To display trades of a single application, select it from the list:

Switzerland - Pennant
x1
Euro Truck Simulator 2
Switzerland - Pennant
Type: Cabin Accessory
Market price: ~0.36 USD
A pennant of a country you may have passed through on your travels - Switzerland. Use it as to further customize your truck interior.
Czech Republic - Pennant
x1
Euro Truck Simulator 2
Czech Republic - Pennant
Type: Cabin Accessory
A pennant of a country you may have passed through on your travels - Czech Republic. Use it as to further customize your truck interior.
Norway - Pennant
Euro Truck Simulator 2
x0
Norway - Pennant
Type: Cabin Accessory
Market price: ~0.33 USD
Sweden - Pennant
Euro Truck Simulator 2
x0
Sweden - Pennant
Type: Cabin Accessory
Market price: ~0.84 USD