See This Steps
1-Download One
2-There Must Have An Col File Exetret It By Coll Editor: http://www.gtagarage.com/mods/show.php?id=1154
3-If There Is File Named Anything.img Extret it by imgtool
4-When You All Files Are Ready Use 7zip To Make An File_unp { Must Be 7zip }
5-Check You Files That In File_unp There Is File Have Txd And Dff Like This { Tornado.txd Tornado.dff Tornado.col } Check This For All Files
6-Create A New XML In Object Make It Like That Name = {TesT}
7-That What You Add On It

<?xml version="1.0" encoding="UTF-8"?>
<objectlist>
  <object id="0">
    <flags value="0" />
    <texture path="Tornado.txd" />
    <collision type="Tornado.col" />
    <model path="Tornado.dff" distance="299" />
  </object>
 </objectlist>

8-Serch In Your Original Game An Place For You Game Or If You Mod Have An .Tornado.IPL ipl To xml by: http://thijn.minelord.com/vcmp/iplConvert/
But Allways Know That Your Object Id 0 In Object XML = 6000 In Map XML

9-Create An New File in Maps Name {Test}
Paste On It That Xml You Got From The IPL TO XML Page

10-But Always Remember That You Object =0 In Maps= 6000
Why The IPL TO XML Don't Make The Ids ?
"That The Original Game Ids Not VC-MP Ids The VC-MP Begain From 6000"

11-Sry For My Bad English :D

And Thx
MahmoudTornado