As you cross the border from western sahara, head left up onto a slight rise, here the ground is rockier. there is soft sand in the dip. if you get into sand, don't follow the ruts, you'll get bogged!!! You don't have the ground clearance and in someone elses ruts the sand will be softer.
If you come to a soft patch sit and watch some others go through to judge the difficulty and whether an alternative route may be needed, but keep well up to the left and you should be ok. If in doubt walk the route first. even if you do have to cross some sandy stuff, air your tyres down to about 15psi, give it some gas and use momentum to get you through. plan your route on foot first to avoid rocks hidden in the sand.
there is rumour that a 110 was blown up by a mine here some years ago. I personally think the mines risk is overstated in this area. most of the terrain is too rocky for mines, and the soft bits have now all be driven too much for their to be any mines left, but you have to make your own risk assessment about that, I'm not going to carry the can when you drive over one!!

lots of 2wd cars pass this way every day.

there are also links on here about preparing a 2wd to drive the route your intending. Also on how to find the diama crossing. basically it is the last turn on the right before you get to the rosso crossing. when you have missed it (as you probably will!!) turn round at the entrance to the border by the garage (avoiding the hawkers!! - my navigators only comment was -'get me the f--- out of here, and that was before we got to the border) and take the first left, it looks like a little track to no where, but it is the right one. I have done both crossings. Diama is more expensive, but nicer. I think they make it easier deliberately so they can make more money!!

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1990 Landcruiser H60. Full rebuild completed 2014