Hello, I’ve seen RedlineRP videos and the dealerships inside of it.
(Video References GTA 5 Roleplay - 'NEW' REDLINE DEALERSHIP | RedlineRP #785 - YouTube GTA 5 Roleplay - LAMBORGHINI DEALERSHIP ROBBERY | RedlineRP - YouTube)
I have been looking hard but I have not found anything about these custom dealerships.
Are they custom jobs done by map creators?
there is no current way to buy or download the dealership is a custom y-map hat only redline has
thats why the dealer is called redline dealership hope this helped you cant get it unless a redline dev leaks it