iTweePath, moving on path bends.

Hi. I try to move 2 object on path, one by one. When they move direct on path, all is ok. But in a place where path begin bends, distance between the rear and front object reduced. Both object moves by this simple code line: iTween.MoveTo(gameObject, iTween.Hash("path", iTweenPath.GetPath("TestPath"), "speed", 3f, "easetype", iTween.EaseType.linear));

What I need to do, to get same distance between objects on all length of path?

my sample projcets (2 object, 1 script)

p.s. sorry for my english.