i've got 16" teledials on my crossover and also 16" porsche flat dish alloys on my 1970 single cab
running 185/45 on the front and 205/50's on the back, no problems
the only issues you need to keep a eye out for is how low your van is and if you need to use adapters to fit your choice of wheel, if so you will need a decent offset so they tuck in on the back