I currently live in NJ. I've raced at Checkerboards twice for their 2005 and 2006 Turkey Races. It is an old 1/10th scale oval that they converted. Its a bit small for a truggy but fun. Down further in Vineland there is a track but I've never been there. Finally there is Trax70. Not sure what kind of turn out they get. The track is deeper than it is wide. Up in north Jersey there is another small track. Best bet for racing is to head to PA for HobbyHut (where I go), up to CT for Walcott or to Chester, NY for Barnstormers.
There is going to be a new track up in northern NJ soon I hear though.
Best regards,