There ARE differences between wagons and sedans beyond the tailgate and, as an owner of both a w210 and w124 wagon, I can appreciate this more than most. BUT I've been able to find info by searching or get responses to posts I've put up about various problems in the tech section (leaks in the back, accumulators, hydrostrut level system) so I say nice but not a requirement.

abh3
01 e320 WAGON
88 300TE WAGON
too many others of all stripes