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..
Definition of wall for Students. 1 : one of the sides of a room or building. 2 : a solid structure (as of stone) built to enclose or shut off a space The property is surrounded by a brick wall. 3 : something that separates one thing from another a wall of mountains. 4 : a layer of material enclosing space the heart wall the wall of a pipe.