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..
A pony wall, sometimes referred to as a split wall or stacked wall, is a single wall composed of two separate wall types; one built above the other. There are two ways to create a pony wall in Chief Architect - by drawing it using the Pony Wall tool or by specifying a normal wall as a pony wall. Select Edit> Default Settings from the menu.