Bergkamp’s M216 trailer-mounted slurry seal and micro surfacing paver is designed for highway and large preventive maintenance jobs. It provides increased material capacity over truck-mounted units, and is Bergkamp’s largest self-contained slurry seal and micro surfacing paver. The M216 offers improved maneuverability when used with a short-wheelbase truck, and allows contractors to achieve higher truck utilization – since the truck can be used for other applications in the offseason. Slurry seal and micro surfacing is a mixture of aggregate, asphalt emulsion, water and additives that is applied over existing pavement as one smooth layer – which can extend the life of pavement by up to seven or more years. The M216 can carry 16 cubic yards (12.2 cubic metres) of aggregate, 1,500 gallons (5,678 litres) of asphalt emulsion and 1,000 gallons (3,780 litres) of water. The water tank is located at the front of the trailer to provide better weight distribution and handling. It also has a 55-gallon (200-litre) stainless steal additive tank. The pugmill, conveyor and all liquid material tanks are removable. All tanks are bolted in rather than welded, adding extra durability and easy maintenance. The asphalt emulsion and water tanks are separate components, eliminating rust-through and cross-contamination of products. The M216 is run by an on-board engine. It provides flexibility to better manage legal load weight restrictions by adding up to three tag axles, including one behind the drive axle – which increases the wheelbase. Aggregate is delivered to the pugmill by a belt-over-chain conveyor that eliminates slippage. Steep hopper walls minimize bridging problems, while the hopper’s polyethylene lining reduces friction. This eliminates the need for a vibrator, which decreases problems with loose bolts and damage to welds and components. The water, asphalt emulsion and additives ratios are regulated as they are pumped into the pugmill, where they are mixed with the aggregate. The variable-speed, dual-shaft, multi-paddle pugmill has a dual hydraulic drive, which provides even mixture and material flow.