Don't do it.  The van is unstable as is and using under-rated tires is courting with disaster.

Joel David Shortlidge wrote:

     I just got some 205/70R14 Goodyear Spectra passenger tires for my Syncro Weekender.  I got them for $191 for a set of four at K-mart.  They were having a buy three get fourth free deal!  They are treadwear at 400 and guaranteed up to 50,000 miles!  But the sales man said not on a light truck, #$%#.    Has anyone put these or any thing like it on there Syncro?  My only concern is that they are only rated for 2888 lbs. per pair on a axle, my Syncro weights 3045 at the rear axle.  But, I would have to spend $100 to get tires that could Carry that and there were 195/75R14's Joel'87 Syncro Weekender