I saw a post a couple of weeks ago from a guy want more clearance for his 2nd gen Sienna. I think he shimmed the strut mount 1" between the body and mount, and added a 1/2" or 1" larger diameter tire (can't remember). He posted his drawings in the thread, but I can't remember what forum I saw that at and I haven't been able to find it to link to it. I stumbled across it as I am looking for more modern mini van alternative. Lots of things i don't love about the Sienna, but the pickens are slim for late model AWD minivans.
I'll post it up if I can find it. Realistically, I expect there are a tons of reasonable ways to lift it such as strut mount spacers, spring spacers, modified strut housings, airbags, custom springs, using existing springs from something else with the same spring diameter....