2005 Heil 8500 Gallon 4 Compartment Aluminum Tank Trailer Compartment Sizes (2500-1500-1500-3000), DOT-406 Double Bulk Head between every compartment 4 - 6" Bottom Loading Heads with Handles & 1 API Adapter to 3", Vapor Recovery, Civacon Rom II Overfill Protection System, 4" Aluminum Plumbing Air Operated Internal Valves 11R 22.5 Tires on Aluminum Rims Reyco Spring Suspension Holland 2 Speed Crank Dollies Hose Trays on each side Aluminum Tool Box on Right Side