You have a bit of a different situation there with that slide on camper. Significant weight with a high center of gravity. The air springs let you adjust for that difference. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Tom Buese
Sent: Monday, September 7, 2015 3:41 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Air lift best rear spring bags

I have the air bags on my syncro doka for when I slide in the 1200# poptop camper, The Titanic.  Each bag is rated for 1000# & I easily raise the rear of my truck the 3" that it drops w/ the Titanic on board.  With all the paraphanalia that Eric likes to bring along, the bags might not be enough!
YMMV

Mr. BZ

On Mon, Sep 7, 2015 at 10:27 AM, Dennis Haynes <d23haynes57@hotmail.com>
wrote:

> Why do you wish to install them? If you need rear springs you really 
> need rear springs. At this point al the original springs are 
> compressed, stressed, and tired. I have replaced many that have failed 
> due to corrosion and the related stress at the reduced size coils top 
> and bottom. They can fail in such a way that they can fall out. If you 
> need to lift the rear a bit some shims will do the job. It is normal 
> for the 85 especially to sit high in the front. Put two folks in the front seats and they become level.
> I have done so many in the last couple years I keep asset for 2WD and 
> Syncro in stock. My preference is for the springs from Syncro.org 
> (Steve Schwenk). He also sells them through Van-Café.
>
> The Ail Lift springs are a bit unique in that they sit inside the 
> existing springs. They do not provide a great deal of lift but they do 
> stiffen the rear and can have a nice effect on the ride if not over 
> inflated. But first if there is a problem you should fix that first.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On 
> Behalf Of Eric Caron
> Sent: Monday, September 7, 2015 7:41 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Air lift best rear spring bags
>
> Hi Folks,
>
>         Is anyone out there using the Air lift supports in the rear 
> springs  of a Vanagon?
>
>         If so do you have a  link to the correct ones?  I somehow 
> ordered the wrong ones  and don’t want to repeat that mistake.
>
>
> Eric Caron
> 85 GL Auto Westfalia
>

--
Tom Buese