Tamiya is another RC Car Manufacturer and could work in a similar vein to how Lego and Hot Wheels have appeared in Forza Horizon in the past.
Tamiya is famous for their 1/10 Scale Unassembled Kits which they’ve been doing since the 1970’s and I’m sure there’s several people in the community who encountered iconic vehicles such as the Grasshopper, Lunchbox, Frog, Avante, Blackfoot and Clod Buster at some point in their life.
Tamiya focuses on two themes of Remote Control Car primarily: 1) Accurate Depictions of Real-World Cars and 2) Original Designs from the Company’s Past as well as a few new releases.
This Suggestion is primarily for the Original Designs as they are the most iconic and offer a unique experience compared to just a recreation of a production car.
The Tamiya Wild One for example has even been made into a real car which can be Voted on for Horizon here and is available for purchase.
https://www.tamiya.com/english/rc/rc.htm
Examples of iconic Tamiya Original Designs
The Grasshopper 2WD Buggy
The Frog 2WD Buggy
The Avante 4WD Buggy
The Lunchbox Monster Truck
The Monster Beetle
The Blackfoot Monster Truck
The Super Clod Buster Monster Truck
The Raikiri GT Touring Car
The Aqroshot Stadium Truck
The Wild One which has been made into a Real Drivable Car
For anyone interested in Learning about Tamiya or maybe getting a bit of Nostalgia from their childhood I highly recommend the Tamiya Legends YouTube channel which is focused on exploring and experiencing Vintage and Re-Release Tamiya Models.