Mazzer2:
I would look at using the direct ferries to Spain, Poole/Portsmouth to Santander using them means you have still got 6 days to work with when you get to Spain, it used to be about 100 euro cheaper to go through France not sure if that is still the case. For tolls get an AS 24 box as this will cover both France and Spain, get a couple of fuel cards Repsol is probably the most common fuel station in Spain and does fuel cards.
I dunno how quick Morocco customs are today, but getting a 48hr break when taking a load in wasn’t a problem a few years ago.