Prowler

 is a Tier 5 Tank that upgrades from Marine at level 60.

Design
The looks like the Tri-Angle but all of its barrels have an extremely subtle taper to them with a wider base like Huntress. It also has a triangular topper.

Technical
As its tapering barrels and topper imply, the can become invisible. Other than that it is pretty much just a plain Tri-Angle.