I'm in the market for some rims/tires (used aluminum or plain steel) for my 92 previa and wondered what would be a good combination? I've read that the biggest rim i can fit is an 18, but how high can the sidewall be with that 18 on it?? I'm thinking i'd rather have a tire with some meat on it, and not low profile tires. My central idea with the previa, is to make a nice long-distance travel/camping van. Want something that'll be road-steady and responseive but not reach the rim if i do a little light offroading. I'm thinking 15" rim may be too small, but how much is the max sidewall that i can fit in there if i have a 16" rim or 17" rim?