Anyone out there know if there is a way to add an XM system to my vehicle (I don't think it came with the necessary items to have xm function -- but is there any way to know for sure). Is there a part(s) that I can buy which can integrate the system into the truck (instead of hacing to add the parts outside of the factory system). Please advise!

Anyone out there know if there is a way to add an XM system to my vehicle (I don't think it came with the necessary items to have xm function -- but is there any way to know for sure). Is there a part(s) that I can buy which can integrate the system into the truck (instead of hacing to add the parts outside of the factory system). Please advise!

Go to a nice local stereo shop, and they can give you the run down.

Try this web site, http://www.jpcustoms.com.
Look under audio and video, then satilite radio, they have an adapter thats available that will fit the H3, intergrated with factory radio.