do all these companies require that you also show proof of ownership of another vehicle, which is your daily driver? the one I tried here in the NE did.

With my geico policy, it's about that price to add a second vehicle I think so it wouldn't make much difference to insure the merc as a classic if I have to keep the other vehicle up as well.

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1983 300SD with bad undercarriage rust, with old greasecar 2-tank conversion. About 200K miles, just an adolescent but with premature bone disease.