Disclosed is a folding chassis of manually driven carrier vehicles, for example, hand trucks, carts, and strollers, capable of moving over uneven, soft or spongy surfaces and surmounting obstacles. The chassis includes a frame having a reference plane and an arm having a first axis and a second axis, said arm being attached rotatable around the first axis to said frame and configured for attaching rotatable, around the second axis, a wheel arrangement having a diameter at least equal to a half of a width of said frame. Said arm is configured to pivot between at least a first and a second positions of said wheel arrangement, wherein, in the first position, said wheel arrangement is generally perpendicular to said reference plane and wherein, in the second position, said wheel arrangement is adjacent and parallel to said reference plane.