Newark Toyota in Newark, De installs aftermarket parts. I personally have never had anything installed there. I have relatively good experience with Price Toyota in New Castle De. I live in South Jersey as well. Def. avoid Vineland and Turnersville if you can. But, damn near all stealerships are shaddy as hell. just my .02
I purchased my 2013 SR5 from Freedom Toyota in Hamburg PA. While it is a bit of a drive, they have awesome service and they're located right across the highway from Cabela's so I can always make my service runs a two-fer ;)