Hopefully, the wobbly front standard issue on Voigtlanders was confined to the top-of-the-line Bessa II. It had a somewhat unique coupled rangefinder focusing system which moved the entire front standard to focus the lens. This was accomplished via a long arm connected to a focus adjusting knob atop of the camera. Frankly, it wasn't the most robust method to achieve unit focusing design.
The Perkeos all have front cell focusing, which is less problematic. On the Perkeo II that I have, the right hand strut must be manually locked into place after extending the front platform. Once the right strut is in the locked position, the front standard seems pretty solid.
One other note, the Color-Skopar lens is about as good as it gets with regards to a *pocketable* front cell focusing medium format folder.