The wheels will fit and the rubber makes the difference. 275/40 series profile is fine and will rub on extreme rh lock, drivers side only (well it did on mine).... The speedo will be almost 100% accurate as well. The wheels I had were a lot heavier and as such, getting this mass spinning reduced the accelleration and made stopping a bit more protracted and made the steering heavier. Ride was comfy, not crashy though. Despite this, they did look great.... but I didnt like how they drove.
I sold my 20"s and went back to OEM Sportlines. Others on here dont have the same experience and are very happy with them, I am sure they will be along soon.
The van looks great are these the 20 inch oem sportlines if so does the van run better and would they be ok on my carevelle some has told me the caravelles are lower than a normal t5, i am new to all this only had the van for 2 weeks.