I see you're on your way down from the Western Sahara into Mauretania. I was there in 2006 and the border is fascinating: it's a no mans land stretching for several kilometres, basically a minefield, with tons of burnt down car wrecks left and right, and many small potholed roads leading in all directions. Also there are some weird dudes driving around, trying to lure you in other directions than you were driving. We didn't have navigation systems back then, just paper maps, so it was an adventure.

You will probably encounter much more police checks in Mauretania and beyond than in Morocco.

At some border crossings, you can negotiate a visum on the spot. I had a 'visum' written with ballpoint in my passport. No stamps or official stickers, just a signature :) It was reluctantly accepted on my way out of the country.

I drove a sedan from the Netherlands to Burkino Faso, it was an awesome trip.