RVs are allowed on the GSP. When we went to visit my folks on Cape Cod, we always took the GSP to the northern end, then went across the Tappan Zee Bridge and picked up I95 across CT. When DS was going to college at UConn in Storrs, we would take I684 after the bridge to pick up I84 to Hartford.
Traffic on I95 west of New Haven can be very bad, especially if there is an accident. We also regularly hit slow downs in Waterbury and Hartford on I84, but not as bad as on I95. OTOH there were times we just flew on through.
As a heads up, there are several arched bridges on the GSP between exits 135 and about 150 that are lowest on the shoulders. I always drive one lane over from the right in that section. The bridges are well signed.
2003 Winnebago Minnie 24F - Ford E-450๐