Looking at it more closely I see that the roof caught the left front corner of the camper. It's possible that the collapsing roof did not mash the whole cab of the truck but just the extreme left side. If so, the driver may have had room to his or her right.

Look at it closely and you can see someone heading out the passenger door as the roof collapses. Quick thinking.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13