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Sounds like you may have a wheel bearing going. To confirm go to a road with no other traffic, drive at the speed where the noise is louded ,
and then slightly swerve to the left to see if the noise changes . Then try it to the right to see if it's different. Or just listen through some normal curves in roads . Whatever way you do it, Be careful of other cars and of course keep the van under control. At early stages of bearing failure it may be hard to determine which wheel. With the rear ones you can lift the van and spin the wheels by hand to see if one sounds rougher than the other. Using a stethascope can be helpfull.
Also check for play in the rear bearings by grabbing the wheel at the 12 and 6 o'clock and then at 9 and 3 o'clock positions and push and pull.
there should be very slight to no play. Compare both wheels with each other.
Good Luck
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