I will be in much the same situation as you, in Morocco without own transport, looking for a ride into Mauritania--except I will be there in early august. What I have been told is to check out the camppground in Dakhla and ask for people who are planning to head towards Mauritania. I have also been told to try this near the Maur Embassy in Rabat/Casa where you must apply for the visa to get into Maur. I dont know if this helps, but maybe.
Perhaps I will see you in Maur, good luck and happy trails.
--jacob
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