I have stayed in the Fla-Net RV park in Flanders, NJ. It's near full all the time with local workers in 5th wheels and travel trailers. Most of the sites are 30 amp. They have 7 or 8 long pull through sites and maybe a dozen long back in sites with 50 amp service. They are kid and dog friendly.
The location and landscape are pretty and the owners, who live almost on site, work very hard to keep up with the place. It's clean, the power is fairly reliable, and the water is good. The sites are firm, level, and grassy. There is a picnic table and a small fence at each site. Some sites have fire rings, some sites have trees. There are several ponds and large grassy areas with plenty of shade along the sides.
It's VERY close to any kind of shopping or services you could ask for, even within walking distance. Their "swimming pool" is a very large cement wading pool. Only toddlers can actually swim in it
The owners are very nice people, though Terry (the man) is very gruff and sounds like he's grouchy - he's not - that's just his voice.
They truly have the market cornered in that area. There is just no place else to go, but they don't take advantage of you because of it.
I'm not crazy about it because the sites are quite close together (but not so close that it interferes with your slides)and I'm not crazy about New Jersey. However, the fact that the grandchildren live in Budd Lake overrides my likes and dislikes.
Unfortunately, I'm pretty sure that's as close as you can get to Morristown.