Traton trading at mid-point of IPO range in grey market

MILAN (Reuters) - Shares in Volkswagen's truck unit Traton were trading on the grey market at around the mid-point of its initial public offering price (IPO) range ahead of its market debut on Friday.According to German broker Lang & Schwarz, Traton shares have traded at a low of 29.25 euros ($33.3) to a high of 30.95 euros over the past week, although volumes are low. Shares in the IPO are being offered at 27-33 euros.Volkswagen aims to raise up to 1.9 billion euros (1.7 billion pounds) through..