Are we talking about vans or pickups?
A FWD pickup would just plain suck, if it is to be used as a working vehicle, for example on a farm much of the time off road.
A FWD van or mini-van is a different animal, more likely to be on pavement and more likely to not be as heavily loaded and besides, even with a good load they are still front heavy i.e. the weight is over the drive wheels. The people have voted and FWD mini-vans are O.K.
Speaking of giant FWD vans, what could be gianter than the GMC Motorcoach? I drove one this summer- very nice going down the road but very poor drive traction in less than optimal conditions.
The big GMC could be re-engineered for more weight over the front end though, as could most any van.