The Lifeguard Sport Trac is Vapid's take on the Ford Explorer Sport Trac, dressed up for beach patrol duty. It showed up in the trailer footage in classic red and yellow lifeguard livery, which fits Leonida's coastline perfectly. Like most service vehicles in the series, it reads as a set piece for the world rather than something you drive off a dealer lot. Whether it lands in player garages is not confirmed.
The Lifeguard Sport Trac was confirmed through trailer footage, so we know it exists in the game. What we do not know yet is how you get one. Emergency and service vehicles like this are usually parked around the map or tied to specific scripted moments rather than sold, so treat any acquisition method as unconfirmed for now.
If it follows series tradition, your best bet will be finding one on the sand and simply taking it. We will update this entry once Rockstar shows more of how these vehicles work.
The community companion for Grand Theft Auto VI. Database, maps, guides and tools for Vice City and the state of Leonida.