Something we haven`t done in age , car vinyls. What`s recommended to use on the side of a van and the windows of cars?
What do you want to do on the side of a car? Small decal or a something more complex that will go over the curves of the car?
For simple stuff and flat surfaces I use Orafol 3651 (printed) or Oracal 751 (Cut) vinyls.
For more complex stuff I use Avery MPI 1105/DOL 1360z combo (Cast print vinyl and cast laminate)
As far as the window perf, Orafol window perf should be the best on the market.
Hope that helps a bit