10 miles a day shouldn't be a problem. Just FYI, there's a section of trail just west (south on the trail) of Harriman State Park that's pretty taxing. The ups and downs are pretty steep in that area. Harriman is a great section, and if you time it right the blueberries will be in season... a great excuse for taking your time on the trail.

I would suggest trying to lighten your packs if possible down to the 30 lbs range instead of the 40 lbs range. Those ten pounds make a world of difference in terms of hiking comfort.

Anyway, enjoy your hike!