Good to know about Hertline. I tentatively plan a night at 501 (another meal I don't have to carry if I order pizza there), but might stop at Hertline for an early lunch and to get water.
I've got photos of my daughter's climb out of Lehigh Gap! I think I'll be glad I did most of NH last August, once I get to that PA climb.
What about water or campsite out of Lehigh Gap? I plan to allow for a zero day in Palmerton, so possibly will do that climb early morning and hope to camp at about 12 miles.