Looking at the design of the vehicles, it is most based on Dodge, but the Rumpo and the Paradise is based on Ford, and the Feroci is based on an Lexus car. Also, Bravado's logo of a charging bull is a parody of Dodge's ram logo used since 1993. In Grand Theft Auto V they have a TV commercial showcasing the Bison, Gauntlet, and Buffalo, parodying various Dodge commercials.
Bravado is a company that manufactures bras for pregnant women. This may be a play on the fact that the real life counterpart of the Bravado, Dodge has a badge that is considered by some to resemble a diagram of the female reproductive system, when in fact it is the head of a ram.
The bull's mouth of the Bravado logo will look like a glans penis (male sexual organ) when observed closely.
The Feroci and Rumpo/Paradise are the only vehicles that does not take up resemblance of any Dodge vehicles, instead respectively resembling Lexus and Ford models.
By 2013, it appears that Bravado neared bankruptcy at one point, and was bailed out by the Federal Government using taxpayer money. This parodies the actual bailout of GM in the late 2000s. However it was Pontiac that went bankrupt, so it is strange that Imponte is not the company needing a bailout.
Bravado is a word used in the UK. It literally means defiant or swaggering behavior.
Bravado seems to play on it's car names relating to the ram on it's logo, with names such as Buffalo and Bison.