On one forum im on (mp-pistol.com) this guy mounted his using a Blackhawk serpa holster to the underside of the dash... Make sure you have a concealed permit for this though also check vehicle carry laws in your state.
In His dodge Ram
Personally I keep a right hand serpa holster with the belt clip removed stuffed in between my 60/40 seats (this was before my CCP)
Now its glove box, center console, front seat, next to me. Pretty much in arms reach concealed or not. I make it more accessible when Im stopping alot, in a bad neighborhood or have cash on me. Never go anywhere with out my trusty sidekick...
Thank you for exercising your second amendment right.