Keep Conquest Customs, launch ThunderBall Scout, and run them as one architecture.
Why this one
The survey closed the debate. Asked directly whether they'd still recognise the business if the Conquest name was retired, the loyalist segment pushed back hard, because the name was the trust. Asked separately what excited them about the new direction, both segments named the new product rather than a new shop. The research was telling me the answer was both, and that the architecture was the design problem. The dual-brand structure let Conquest carry the credibility (the award, the garage, the parts catalog) while ThunderBall Scout got its own surface to act like a flagship, with its own page, voice, and enquiry flow, and without orphaning either audience.
The trade-off
It's twice the surface to design and maintain, with two voices to keep distinct across the site. Every shared page (homepage, story, footer) became a balancing act over when Conquest leads, when ThunderBall does, and how they sit together without competing for attention. The system is more disciplined than a single-brand site would have been, and the client has to keep operating inside that discipline. I accepted it because the alternative was burning the equity that made the new launch credible in the first place.