Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
1979 Trans-Am Series
Table title:
Results
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Round </th><th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Circuit </th><th colspan=1 rowspan=1 > Winning driver (TA2) </th><th colspan=1 rowspan=1 > Winning vehicle (TA2) </th><th colspan=1 rowspan=1 > Winning driver (TA1) </th><th colspan=1 rowspan=1 > Winning vehicle (TA1) </th></tr>
<tr> <td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > May 6 </td><td colspan=1 rowspan=1 > Mexico Mexico City </td><td colspan=1 rowspan=1 > United States John Paul </td><td class="highlighted"  colspan=1 rowspan=1 > Porsche 935 </td><td colspan=1 rowspan=1 > Mexico Miguel Muñiz </td><td colspan=1 rowspan=1 > Chevrolet Camaro </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > June 3 </td><td colspan=1 rowspan=1 > Canada Westwood </td><td colspan=1 rowspan=1 > United States John Paul </td><td class="highlighted"  colspan=1 rowspan=1 > Porsche 935 </td><td colspan=1 rowspan=1 > United States Gary Carter </td><td colspan=1 rowspan=1 > Chevrolet Corvette </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 </td><td colspan=1 rowspan=1 > July 7 </td><td colspan=1 rowspan=1 > United States Watkins Glen ‡ </td><td colspan=1 rowspan=1 > United States Roy Woods United States Bob Akin </td><td class="highlighted"  colspan=1 rowspan=1 > Porsche 935 </td><td colspan=1 rowspan=1 > United States Bob Tullius United States Brian Fuerstenau </td><td colspan=1 rowspan=1 > Triumph TR8 </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > July 21 </td><td colspan=1 rowspan=1 > United States Road America </td><td colspan=1 rowspan=1 > United States Peter Gregg </td><td class="highlighted"  colspan=1 rowspan=1 > Porsche 935 </td><td colspan=1 rowspan=1 > United States Gene Bothello </td><td colspan=1 rowspan=1 > Chevrolet Corvette </td></tr>
<tr> <td colspan=1 rowspan=1 > 5 </td><td colspan=1 rowspan=1 > August 5 </td><td colspan=1 rowspan=1 > United States Watkins Glen </td><td colspan=1 rowspan=1 > United States John Paul </td><td class="highlighted"  colspan=1 rowspan=1 > Porsche 935 </td><td colspan=1 rowspan=1 > United States Bob Tullius </td><td colspan=1 rowspan=1 > Triumph TR8 </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 </td><td colspan=1 rowspan=1 > August 19 </td><td colspan=1 rowspan=1 > Canada Mosport </td><td colspan=1 rowspan=1 > United States John Paul </td><td class="highlighted"  colspan=1 rowspan=1 > Porsche 935 </td><td colspan=1 rowspan=1 > United States Gene Bothello </td><td colspan=1 rowspan=1 > Chevrolet Corvette </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 </td><td colspan=1 rowspan=1 > September 1 </td><td colspan=1 rowspan=1 > Canada Trois-Rivières </td><td colspan=1 rowspan=1 > United States John Paul </td><td class="highlighted"  colspan=1 rowspan=1 > Porsche 935 </td><td colspan=1 rowspan=1 > United States Gene Bothello </td><td colspan=1 rowspan=1 > Chevrolet Corvette </td></tr>
<tr> <td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > October 14 </td><td colspan=1 rowspan=1 > United States Laguna Seca </td><td colspan=1 rowspan=1 > United States Peter Gregg </td><td class="highlighted"  colspan=1 rowspan=1 > Porsche 935 </td><td colspan=1 rowspan=1 > United States Bob Tullius </td><td colspan=1 rowspan=1 > Triumph TR8 </td></tr>
</table>
Question:
Which vehicle was the overall winner of the 1979 Trans-Am Series?
Answer:
In the 1979 Trans-Am Series, Overall winner was Porsche 935.