Kat, no issues with long wheelbase...there is a turn that will require you to back down to the next turn (normal way to do it) but that is about it.
It is much better to keep the group at about 5-6 vehicles (maybe do a couple groups on different days if more want to do it) so you can make good time and still enjoy everything. When Swede led us through there I think the whole trip took about 9-10 hours (from memory)...that included lunch with some climbing around at the Devils Kitchen, the side trip and hike to the confluence overlook and hiking through the cracks.
It is a beautiful trail and worth the long day!