Hi, sounds a great way to travel Morocco especially with your accom always with you!! you might want to rent a car or 4x4 for some areas that are passable for a car but too rough for a motorhome, eg driving up through todra gorge to imilchil or dades gorge through to msemrir and imilchil and down to todra gorge - which we have done in a car no probs and probably could do a campervan, old moroccan minivans drive around there....
and the drives from anmiter just past telouet up to tizga or through paradise valley to ait ben haddou but they are better with 4x4 so maybe you could get onto excursions for that. which i am actually looking at going into business to do as i pretty much have a moroccan family now and lots of good and reliable contacts, have had 14 trips over the last 2 years so know lots of good places to stay and visit etc.
but anyway as for your letter i recommend the michelin maps as they show the green/scenic routes around the country. i also recommend the lonely planet in combination with the DK Eyewitness guide (hope im telling you the right one!! ive just put it back into the library, which i will probably buy my own one day. its excellent for recommended drives and visits around each locality, what to see, what the road is like, etc and it is full of lovely colour pictures.
i do particularly recommend going to telouet which is 2-3 hours from marrakech, the whole drive there is lovely and takes you over the second highest pass in morocco which is tizintichka on the way to ouarzazate. its a lovely quiet valley area of berber villages, fetile valleys and purple and orange earth hills, with a gloui palace that i love visiting each time im there, its unesco but not being maintained so slowly deteriorating from its original glorious state and may only survive another few years. telouet is also the best place i know to check out, receive good info sessions on moroccan carpets which are excellent souvenirs and pay decent prices for good quality whereas the hordes of shops all over morocco can become quite off putting. interesting and colourful souk on thursdays where berber villagers come from miles around. good place for berber omelette (at chez mohammed palace restaurant in the centre) and up the vally an excellent place to camp with your camper van at tasgha restaurant camping auberge 4.5 km from telouet beside a bubbling brook under huge walnut and apple trees. some nice walks from there too. kasbahs etc.
november, coming into winter is a nice time too for blue skies, especially in the desert, deeper blue for photos etc. and possibly early snow on the mountains for added scenery!
i recommend places like cascade douzoud and particularly the tafroute tiznit taroudant circuit. and asilah tetouan and chefchouen circuit. the road from chefchouen down to ouazzane is also very scenic and then volibulis is wonderful, but take a guided tour map from out of the lonely planet or eyewitness guide to maximise the visit, locating various mosaics, houses and apartments amongst the roman city ruins.
we visited moulay bousselham and think its also a really lovely coastal spot, i could imagine it as a great place to park a camper van and sit with coffee and watch the sunset.
let me know if you want any more info.