There is no inter-island vehicle ferry — you re-rent on every island
Hawaii has no car ferry between its major islands. The Hawaii Superferry, which once carried vehicles, shut down in March 2009 after the state Supreme Court voided its environmental exemption, and it never returned. The only passenger ferry — Expeditions, Lahaina (Maui) to Manele Bay (Lanai) — does not carry rental cars or RVs. Plan a separate rental, pickup, and drop-off on each island; you cannot drive your Maui rig onto a boat to the Big Island.
Source: Hawaii Supreme Court / Hawaii Superferry shutdown (2009)




