I don't know what an "SOV" (the failed part that led to the tow in the first place) is, but did the car make it to the mechanic for that repair? If so, can the dangling valance just be torn off so that the car can be driven to and from whichever body shop does the work?

I don't know much about towing, but I've watched it done a few times, and I can see how things can go wrong. I think there's a risk each time it occurs, which would outweigh the risk of driving the vehicle under its own power. I'd make this car driveable first, if it isn't already, and avoid towing.

MB's look sad on flatbeds, anyway.

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1996 C280 289K Traded
1997 E420 167K Traded
2001 S430 240K Traded
2010 E550 4matic 80K
2000 GMC Jimmy 198K Gone to Boneyard
2003 Camry LE 196K
2011 Mazda3 i Sport 31K