Take the northern route. We've made the trip from eastern MA to MN three times in the past year and that's the route we've always taken. I agree with Camping Couple, the best route to Providence from I-90 is either 495 or 290 - my personal preference is 495. The stretch of 95 from NYC to Providence is always very heavy traffic, and last time I was on it there was also a lot of construction.
Not very familiar with campgrounds in the Providence area as we're typically camping on the Cape, but I have heard that Normandy Farms is very nice.
Rob & Kelly, Bella & Brady (Miniature Schnauzers)
2016 Eagle 323LKTS
2016 Ram 2500 6.7L CTD
2015 White Hawk 29REKS Summit Edition (Traded)