Lego 6851 Classic Blacktron Tri-Wheeled Tyrax with box and instructions. | eBay
Neo Space Blacktron 6851 Tri-Wheeled Tyrax Squad. Only reason I could see for a tricycle would be a mounted gun on the back. Should easily be able to modify it to have
Buy 6851 Space Blacktron - Tri-Wheeled Tyrax LEGO® Toys on the Store | Auctions | Best Deals at the Lowest Price
LEGO 6851 Tri-Wheeled Tyrax Set Parts Inventory and Instructions - LEGO Reference Guide