The trailer is quite narrow and fits between the Pontoons. The Trailer actually lifts the deck of the Boat and does not support the Pontoons and the wheel base is quite small. This style of pontoon boat trailer can be retrieved and launched in the shallowest of water, since the Pontoons are very low to the ground.
Tanking is, as its name suggest a method of sealing a wall to prevent water ingress (think 'water tank). often mis-specified as a cure for damp problems it is basically a waterproof cementious slurry (wet mix) that is applied to a surface to prevent water penetrating the internal surface of a building..
Back-fill: Placed behind the retaining wall to promote drainage of water away from the wall. This prevents water from building up behind the wall; the leading cause of wall failure. Drainage Pipe: As water drains through the back-fill of a retaining wall, the drainage pipe then carries the water away from the wall. Connections: All retaining walls will use some sort of connection to secure the block courses. Fiberglass pins, molded pins, a lipped system, or the use of masonry adhesive.