Tiny houses usually are standard from the point of size. it’s not a container but the shape is like that, usually the width of the tiny houses are 2.4 or 2.5 m from outside. the length is 6 m 7 m 8 m, but it can be more. The hight usually is not more than 4 m.
If tiny houses are movable the length should not be more than 7 m in most countries. there is a different law for that one from the traffic department. For example in turkey the maximum will be 8 m but the standard usually is 7 m, so you can move it from one land to other land or from a garden to another garden..