Generically, nothing but the width of the brake drums. But this particular one is has 5-speed conversion.
The Type III rides nicely because the front and rear subframes are mounted in rubber bushings. But the front framehead has four 'fingers' the subframe mounts to. If it's tweaked the wheel alignment becomes a struggle, and it's easier to tweak than the Type I framehead. The Type I beam will bend before the framehead — I know I've done it.
For stoutness: Link-pin > ball joint > (Type III or Macpherson strut). Not sure how the last two sort out.