I 84 out of Scranton has a long down hill run. We have taken out 5th wheel from I 81 to Route 209 thru the Delaware Water Gap National Rec. Area. No commercial trucks allowed other than service truck. 20 miles of scenery. Just camp through this week with a car and found the section between 81 and the park has a lot of pot holes but the park road is in very good shape. Speed is 35 and 45 but no hills just curves.
I would recommend taking the bypass from I 84 to I 91 around Harrisburg in Conn. Taking our 5th wheel before the bypass was build was stressful. Lots of traffic anytime of day. I 84 will connect with Mass Pike and that with both the inner and outer builtway around Boston. DO NOT go thru Boston with your 5th wheel.
No real way to avoid toll roads in New England, btw.