Rockstar is using the Riata Classic as an edition sweetener: this first-generation Ford Bronco lookalike comes with the GTA 6 Ultimate Edition. Vapid's modern Riata already covers current Bronco duty, and this is the vintage counterpart, confirmed through official screenshots. No performance data has surfaced in the files yet. Expect a simple, charming old 4x4 rather than a serious rock crawler.
This one has a confirmed answer: the Riata Classic is included with the Ultimate Edition of GTA 6. Rockstar has not said if it will become available to other players later or stay locked to that edition permanently.
It was shown in official screenshots, and no datamined performance figures for it have appeared so far.
The community companion for Grand Theft Auto VI. Database, maps, guides and tools for Vice City and the state of Leonida.