Never heard of a propane restriction for RVs on the NJ TPK. I've traveled it numerous times with the rv.
Not sure where you are so...
I'd take the NJ TPK to 287 North. At Mahwah take 87 North (NYS Thruway) to:
Option 1: Newburg - pick up 84 into Connecticut to I-95, Mass Pike. If you go this way fuel up just before hitting the Mass Pike. Its way cheaper, and there happens to be a Cracker Barrel at the exit. FWIW we always seem to hit lots of traffic around Hartford, CT.
Option 2: Take 87 all the way up and pick up 95 (Mass Pike) from there. Yes, its longer then 84. Perhaps the time is the same but the stress and aggravation sure isn't.
Take the Mass Pike to 495, avoid Boston. You'll pick 95 backup north of Boston. There is a Cabellas with great overnight parking just off 495 if your looking for a overnight. They also have a dump station ($) if you need it and a grocery store in the same parking lot.
And FYI - The TapanZee Bridge is no more. Its been replaced by the Mario Cuomo Bridge. No change to the route but you might notice the name discrepancy.
My suggestions are based on numerous trips from northern NJ to Maine over the years. Might not always be the fastest route, but it gets us there safely and not feeling stressed out. Or with the warned about broken axels from the miserable excuse for some roads around NYC. Happy Trails!
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