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Incidentially, the Ford vans all have the same wheelbase and despite that I would argue that a longer wheelbase is better offroad.
You may be thinking about the clearance, since the wheels are in the same place the rear overhangs more in the EB.
Even so I wouldn't let that stop you, if you find a good EB van at your price, don't pass it up for an RB. Nobody I've seen crabbing about how they wish they had gone RB... I'm biased of course because I went EB even though I was dead-set on an RB at the beginning.
Good luck, we've seen lots of droolworthy builds in the Homemade / Ground Up section!