Hey vixnfox,
I didn't even add anything to the CSS layout. I just added this:
Code:
<tr>
<td class="total-name">{$lng.lbl_total_weight}:</td>
<td class="total-value">{$total_weight_shipping_valid} KG</td>
</tr>
& made the "lbl_total_weight" Label and it worked a treat.