Depends on how old the mobile home was. Anything after the late 70 early 80 is copper. It is illeagel to use alum wire in a trailor that is built after that time. If the alum siding is really bad burnt or melted the yard will prob give unclean price. If u see some blobs of melted alum laying around go on and pick them up too. Don't matter if they are covered in ash or have metal in them. Most yards will pay irony price for that which is usually about double shread price. A fifty pound feed sack can hold up to 70-80 lbs of melted alum blobs. It helps out