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
LEGO Space Blacktron 2 | Brickset
LEGO 6861-2 Blacktron 2 Super Model Building Instruction | BrickEconomy
Tri-Wheeled Tyrax : Set 6851-1 | BrickLink
6851-1: Tri-Wheeled Tyrax (building steps) from BrickLink Studio