A little googling yields a more appropriate translation as "one of a kind"   likely a very limited production prototype vehicle.  It is used in other german contexts to describe "one-off" furniture or clothing designs.

Theodore Hoekman
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On 2013-07-11, at 11:34 PM, Stephen Engel wrote:

> The translation of the root words would be:
> 
> Einzelstuck mit Doppelachse = Single piece with double axle 
> 
> What they mean by "single piece" , I don't know. Might be referring to the body?
> 
> Auf Wiedersehen!
> Steve
> 
> 
> --------------------------------------------
> On Thu, 7/11/13, Scott Ohana <scottdaniel@TURBOVANS.COM> wrote:
> 
> Subject: Re: 6 Wheeler Vanagon on German eBay
> To: vanagon@GERRY.VANAGON.COM
> Date: Thursday, July 11, 2013, 7:52 PM
> 
> cool..
> what's this mean........."*Einzelst�ck mit
> Doppelachse'  ?
> 
> *DOPPLE is gear case ..something like that.
> mit is with of course.
> einselstuck....auto trans ?
> 
> autostick shift automatic trans ?
> 
> 
> 
> On 7/11/2013 3:46 PM, Jeff Schwaia wrote:
>> German eBay:
>> 
>> www.ebay.de/itm/261244362356
>>