Have you ever had problems with the grease being blown out of the headsets with the NS? It looks like they are positioned just about the right height for that. I have one bike with a roller bearing headset that i have to wrap the head tube to keep it from getting blown out.
No. The crown of the fork rests in the "cradle" of the rack and takes the weight of the bike. It's a really well thought out piece of gear. Bummer is I can't use it with my Hallmark w/o some kind of hitch extension because my camper extends past the truck bed.