When looking at routes to Camp Verde, coming from the West and/or North, you might notice a "shortcut" of Hwy-89A from Hwy-40 near Flagstaff to Sedona (and then on to Camp Verde). This a very scenic drive but one you might not want to tackle with a 40' RV behind you. And then there is the traffic congestion in Sedona and their love of Traffic Circles. Take I-17 to Camp Verde and wait until you have parked the RV and then take your tow vehicle (or Tow'd for you MH people) to explore this road.
P.S. Do not even think about towing the RV through Jerome either. It can be done (as some here can attest) but if the citizenry doesn't get you, the overhanging buildings will.