Thank you all.
We've been put off the idea of RVing by responses we've had to a thread on Trip Advisor but you've rekindled our enthusiasm. We just love the freedom RVs provide.
We're thinking of hiring a C25 - possibly out of Boston.
The White Mountain loop sounds like a "must" and we want to cut across to Killington via Hanover and then head north via Burlington and then down to Sherman.
If we decided to pick up the RV at New Haven, would we find a camp ground close enough in to Boston to allow us to explore the city using public transport - or would we be better exploring Boston first and then picking up an RV?