We did:
South to North: F208 from Kirkjubaejarklaustur to Landmannalaugar and on to the F26 (Sprengisandur), F26 to the North (Godafoss). Stayed overnight at Holaskjol, Landmannalaugar and Nyidalur, all huts with camping facilities.
All very doable, F208 from Holaskjol to Landmannalaugar very beautiful, with several fords, none too difficult. To reach the campsite at Landmannalaugar you need to cross two fords that can be deep, depending on rain. Same on F26 shortly before and after Nyidalur hut.
North to South: F756 ('Old Kjolur' from Reykir, F35 ('Kjolur'), F338, F337 to Thingvallavatn. Stayed overnight at Hveravellir. All very doable, F35 has no fords any more, but was in very bad shape this year. Worse than any road we have done.
South to Nord again: 1 from Reykjavik, 47, 520, 52, 550 (Kaldidalur), F578, 704 to Laugarbakki. Stayed overnight in Husafell (big resort with campsite). All very doable, the ford from the video above was on the F578.
Only the F208 really needed the raised suspension to drive on (a real mountain road sometimes, with big rocks, holes, etc). All the other roads were very doable with the standard bottom clearance, except for the fords, obviously.
We didn't go to Askja (F88, F210) in the end: it had been raining a few days there before we got there, according to Icelanders the rivers in the region were too high to cross safely; the hut there had already closed; the whole region was in clouds and mist, so nothing to bee seen there.
We can highly recommend this booklet for your planning:
It is in English, you can buy it on
amazon.de. From the description:
TRACKBOOK ICELAND Your indispensable companion when driving into the Highland - 58 adventure tracks in the Highland of Iceland in road-book style - Difficulty from easy to extreme, for first explorers and experts - Detailed information on river crossings, track conditions - GPS information for relevant positions - 57 track maps aligned to use with Mál og mennings mal highland map - Background on driving under specific highland conditions - Usability rating of the tracks for different vehicle types - Easy to use system to plan your individual route.