Ahem. Allow me to elaborate. At first, the only way I could use it in the truck was with one of those crappy Radio Shack mini FM transmitters. It worked, but it sucked. I then discovered that Sony used to make a device that works with my stereo, and allows multiple auxillary sources to be attached via RCA cables. I located one such device, mounted it under my seat, and now simply have to plug in the mini stereo plug into the iPod's headphone jack, and the entire contents of my iPod are available through the head unit, via RCA cables. My reference to hardwiring was a poor choice of words, but intended to express the difference between being sent to the stereo by a crappy little FM transmitter versus a physical connection through the cables.
Take care,
~Chris