turbo, you're not paying attention to comfun's original post, he said he has to "swing wider" in a turn with his shorter TT than with his old fifth, so he doesn't hit something, and you are talking about something completed unrelated.
comfun, that is odd, no doubt. Even if the axles on the toyhauler are set back farther, one wouldn't expect them to be farther back than on a much longer fifth. And as the rear bumper of the TV swings out in a turn, that also helps the TT follow. The hitch point on a fifth is well inside of that curve.