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 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.