1) First of all you are lucky that i found you in this malaysian rc tank site, as it took me 2 months to track and check entirely all models and shops in the country.
2) There are no big importers but small individual ones that orders by phone and made visits to the factory in china currently because, the china ones are affordable by us 
    and the ,,,
    chinese suppliers are only interested for big quantity rc tank orders to be placed  by the malaysian toy businesses.
3) My friend is selling tanks  currently and am ever willing to help you get the metal road wheels ( called caterpillar include sprockets and metal gear)
    smoke generators as well from the real shop that has service parts in mind for real customers.
4) i have 5 heng long tanks now and currently upgrading one at a time, as it takes a cost of rm 725 /-to each model which is the ultimate perfect,includes 3000mah
    battery and weigh upgrade.
5) i am a serious fan of RC tanks and don't fool around for the profit if you think i am not genuine.
6) ALL PARTS CAN BE UPGRADED EXCEPT SADLY NOT THE HOP UP GUN SYSTEM AND ADDITIONAL REISIN ATTACHMENTS LIKE THE MARUI OF JAPAN TANKS.
7)MAYBE WE COULD MEET UP SINCE YOU ARE IN THIS PROFESSIONAL  HOBBY , PERHAPS NEXT WEEK.
   YOU CAN REACH ME AT MY OFFICE AT 0322958130.  

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Added on June 18, 2008, 10:43 pm
didn't knew of a young lady would be interested in rc tanks.
now thats  a fantastic wonder to know one.