OK, now I actually clicked on the link. As someone who has traveled WAY too much to look at cars, I can tell you that I would not drive across town for that. It is simply not a nice car. I love the SDL model and have owned a good one, but when these cars transition from cucumber to pickle, it's an ugly thing. ANd they will never be a cucumber again.
Cucumber Mercedes are worth good money. Pickles are not worth dick. The two wagons in the link are also extreme pickles. I can smell them from here, and I'm in CA. I have a good friend who is a dealer and he's bought hundreds of used cars in Florida. The major problem is not rust, (though it can be a problem), it's the humidity. Cars get musty inside and in some cases, they never dry-out properly. And by never, I mean NEVER. The only way to buy a 25 or 30 y.o. Mercedes, IMO, is to buy a nice, dry car that does not smell like ass. You will pay more. Fresh blueberries are expensive. Moldy ones are not. The market recognizes this. You will put maintenance $$ into any old Mercedes, but in the case of a nice one, you will not be flushing $$ down a rabbit hole.
Life is too short for schit boxes. JMHO.