Firing Deck

Some Transport models have ‘Firing Deck x’ listed in their abilities. Each time such a model is selected to shoot in the Shooting phase, you can select up to ‘x’ models embarked within it. Then, for each of those embarked models, you can select one ranged weapon that embarked model is equipped with. Until that Transport model has resolved all of its attacks, it counts as being equipped with all of the weapons you selected in this way, in addition to its other weapons.

– Core Book

If your Transporter has +1 hit, the Unit embarked has +1 hit.

The Units embarked can shoot even after a fallback move, into the transporter.