Yes they are, we took our WK to Iceland twice (long time ago now 2013+2014) hundreds of river crossings, rough terrain, volcanic ash/sand a lot of washboard. No problems at all.
Jeep is still going well today, but 99% tarmac.
Thanks for posting up, good to see a WK in the great outdoors.
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Sounds like you had some fun adventures! Are they documented on this forum anywhere?