I bought my van from a friend so I have followed the van for years and when he first bought it it had Hankook Vantra LT (RA18) LT185/R-14 on and it was the best driving vanagon i have ever driven. He then swallowed the gowesty cool aid and and bought their package and was very unhappy I am convinced to get  a decent ride you need to modify the suspension heavily from stock. I have bought a set of hankook ra18 tires from simple tires for  ~ $275 DELIVERED!  IN 2 DAYS on black friday have not got them on yet as refinishing the wheels now
MR