That overhang is definitely the weakest point of the extended length for off-roading; the rear bumper (or trailer hitch if you have one) will touch the ground in water bars (dips) or on steep departure angle. So if the primary use for your van conversion is off-roading and getting anywhere is very important for you, then consider the long length instead. On the other hand, if the primary use for your van is to get you to the trailhead to ride your bike (like us!), then you’ll be able to make it. Personally we wouldn’t want to compromise on interior space, so we don’t look back on the extended length. We see our van more like a very capable RV, not like a Jeep.