US 30 to Philly/Trenton, rt 27 in NJ to NY
(obvious skipping some connecting roads for brevity)
1. What sort of life insurance do you have? A portion of U.S. 30 around York, PA heading east through Lancaster is a multi-lane, limited access highway with intense traffic. It them narrows down to two lanes but still carries heavy traffic depsite the fact that there are various stages of by-pass expressway. The riding would pretty much suck big time from at least York all the way to the Philadelphia city line, where U.S. 30 becomes a city street (Lancaster Ave.) with a bike lane in places. U.S. 30 eventually combines with I-76 and then I-676 before crossing into NJ. Both roads are off limtis to bikes. (You can cross into NJ on the pedestrian/bike path of the Ben Franklin Bridge.) I suggest taking a look at the PA bike route maps. Being familiar with the area, some of the roads are not the greatest, but they beat the hell out of U.S. 30 in that part of the state.
2. How do you plan to get to Trenton from Philadelphia?
3. SR 27 in NJ looks like it would be no fun at all from a traffic and scenery perspective. Some of the most densley populated real estate in the most densley populated state in the nation. I have an cool route from Lambertville, NJ to Hoboken, NJ (ferry to NYC) if you are interested, but it can only be ridden on a weekend, and there is no camping.
4. What is your ultimate destination? If NYC itself, note that the only way you can actually ride a bike into NYC from the east is the GW Bridge. There are, however, rail options.