One of the reasons why Enus is based on both Bentley and Rolls-Royce might be due that Bentley Motors Limited is the direct successor of Rolls-Royce Motors. Several Rolls-Royce cars, like the Rolls Royce Corniche, were also commercialized as Bentley Continental vehicles, too.
Enus is likely a play on the word 'anus'.
The Roosevelt Valor can have a hood ornament called "Diamond Wing Badge". This is the same one used on some of the vehicles made by Enus, despite it being a car that is made by Albany.