The Boat Trailer is a towable utility trailer from Grand Theft Auto V and GTA Online that is due to appear in Grand Theft Auto VI. It was first spotted in the opening shot of the first trailer, hitched to a Bobcat XL and carrying an unnamed bow-rider motorboat, and it features a padded single-axle metal frame with a jockey wheel and brake at the front.
Vehicle data via GTA Wiki (Fandom), CC BY-SA 3.0.