The Sony that comes in the new trailers is way under $200 at car stereo stores.
New speakers are in the $50 range.
That Sony will hook up an iPod via USB, Bluetooth, or you can put the iPod inside of it where normally the CD player would go.
This is OK for the newer trailers because the Blu-ray player is patched into the stereo.
If you have no Blu-ray player, you may want to opt for a CD unit and play the iPod via USB or Bluetooth.
For $200 you can update you whole sound system to the latest and greatest.
2013 Classic 30 Limited
2007 Silver Toyota Tundra Crew Max Limited 5.7 iForce
2006 Vivid Black Harley-Davidson Road King Classic
1999 Black Nissan Pathfinder LE
WBCCI #1811, Region 6, Unit 56