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I'm not so sure it'll be that easy to do a roll pan on a caravan. I'm pretty sure there's bumper structure under that cover that might interfere with a completely smooth/rounded roll pan. You could pop the bumper cover off and have a look, and even if it wasn't fully rounded a shorter cover with less parachute (or maybe a shallow-angle diffuser up to the rear axle?) could wrap-around into wheel/side skirt. I'm thinking vertical to slight rearward taper like behind the Prius' rear wheels.
Really chopping the underhang off the rear bumper to eliminate the parachute and maybe lowering it in the rear could reduce wake size. It would make a shallow diffuser easier and more effective as well. I'm almost certain there are airbag leveling kits for this era van that would retain load-carrying ability even with a 2" or so rear drop.
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