See Figures 1 through 4
Fig. Fig. 1: When raising the front of the van, always support the vehicle with jackstands:
Fig. Fig. 2: Be sure to position the jackstands beneath the frame rail
The following safety points cannot be overemphasized:
Always block the opposite wheel or wheels to keep the vehicle from rolling off the jack.
When raising the front of the vehicle, firmly apply the parking brake.
When the drive wheels are to remain on the ground, leave the vehicle in gear to help prevent it from rolling.
Always use jackstands to support the vehicle when you are working underneath. Place the stands beneath the vehicle's jacking brackets. Before climbing underneath, rock the vehicle a bit to make sure it is firmly supported.
Fig. Fig. 3: Raise the rear of the van with a hydraulic jack beneath any one of the lifting points ...
Fig. Fig. 4: ... then position jackstands at the appropriate points of the frame rail