Yeah ideal for practicing.... only really become a real pain when you're getting paid to shoot a stranger's car!

There's more on that page if you scroll down too. Not quite the same effect as you're going for there as I've balanced the background exposure in the Capri ones, but I've got some blacked out background ones too I could let you see....

PS, Travelpak doesn't work as a remote trigger, sounded like you thought it did? Pulsars or Pocket Wizards do the trick.
And also you'll need at least two Travelpaks if doing a car as the leads are nowhere near long enough to get the right positioning with just one