Personally,
I will have to say , if the ground is inclined more than a couple of
inches say..
and the van is lined up with the slope ( like not 'across ' )

I can see chocking the rear wheels with really good chocks, parking
brake on firmly ..
then jack up front.
That I regard as pretty safe.

if the idea is to raise both ends of the van ..
I 'suppose' if all four tires  on are ramps , with nice round dips in
them ..
that 'might' be ok.
  Half the time we need the van supported by the frame or jacking points
to work on brakes/suspension etc.
Even if the body of the van is level ..
like taller jack stands at one end..
that is still inheritantly risky.  ( why can't I spell 'inherantly' ??
spell checker doesn't recognize it. )

S
a safety nut actually.

On 8/22/2012 10:22 AM, David Beierl wrote:
> At 02:09 AM 8/22/2012, neil n wrote:
>> The issue is limited work space on a sloped drive way. I'm uncomfortable
>> raising the rear up on jack stands. I'm OK with raising one front
>> corner at
>> a time to do the upper control arm bushings.
>
> If the slope's within reason, build four inverted ramps that match
> the slope; have all weight-bearing points  on a level surface. That
> will take away all the horizontal components of your load vectors on
> both van and stands, and give you a setup that's just as stable as it
> would be on the flat.
>
> Yrs,
> d
>