Yep...the parking was thought. However, if you leave early and arrive before the main group there is lots of space. I see no reason to wait until 10am to leave Kingman. We did the whole run and followed 95 down to I-10 and made it back by 4pm.
What fell off? My front right shock came apart and I had to re-assemble in Kingman after about 150 miles of spring only. After the discovery I let the rest of the "speedracers" go ahead and took a leasurely drive from Grand Canyon Caverns to Kingman.