The Speedo is Vapid's cargo delivery van, a workhorse from GTA IV, GTA V and GTA Online due to appear in Grand Theft Auto VI. Its design resembles a 2006-2010 Chevrolet Express with front-end and rear-bumper elements borrowed from the 2003-2007 Ford E-Series.
Vehicle data via GTA Wiki (Fandom), CC BY-SA 3.0.