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they do suffer rust yes but what car doesn't? and motorway miles aren't an issue on the OM606 - it's such an overbuilt engine you can punish it like this...
https://www.youtube.com/watch?v=uIuZyliL8ts
mine has had all the electronics cut out and is running a dieselmaken manual fuel pump which is great but owning a 29 year old car does require maintenance of course... i learn something new about it every time i open the bonnet
Long term ownership of a G Wagon has taught me that they are not indestructible, in the sense that something is likely to break every time you drive it. But they are great cars. They do suffer from rust and the engines are not suited to lots of motorway miles.