2 new motorbikes found under Decor / Misc. Decor, both cost 0
Use the cheat "moveobjects on" to be able to park them on the ferry. These 2 are exclusively designed to go on the ferry and won't suit anywhere else.
You need Ambitions or a later game for the bikes to show.
*** NB Not compatible with game mod "NRaas_Overwatch", it removes vehicles automatically.
Ferry boat - 2 transported motorbikes (MediaFire)