Thank you for mentioning the PA race. I think the NJ race might be this: Garden State Swimrun
. I'll probably give this one a go, maybe the PA one (there's a substantive price difference between the two). I'll look forward to travelling without a bike.
+1 for Garden State Swim Run, I did it last year as a prep for SOS, mostly solo athletes and a fun low key race! Lots of up and down on the trails and pretty little lakes would definitely do again if it fits the schedule.