I don't know about RVWizard but I've used the AllTrails app and Google Maps with great results.
I've hiked pretty much the entire AT section from Bear Mountain in NY, through NJ to eastern PA. The section in NY from Rt. 17 to Rt. 17A is a great section. In NJ an AT 'loop' would be from Delaware Water Gap up to Sunfish Pond and then back on Dunnfield Creek. PA has tons of rocks on the trail but the areas around Hamburg, PA have some great views.
Remember most campgrounds up north shut down around Oct. 15 so hookups will be hard to find. It's also COLD on the AT ridgeline. One March it was nice in the valley and we ended up camping in 8 inches of snow at the top!
Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
'17 Winnebago View 24V, '02 R-Vision B+
RVing for 20 years & 200,000+ miles