sorry ...
i jumped through a million assumptions ... here are the major two
1: GVW is about the same
2: transmission will be 'rated' for about the same

curb weight of the MB is about 3600
curb weight of a shell Metro is about 2700
plus ~1000 worth of shelving/cabinets/camping gear

hope that makes my delusions a bit more clear

cheers
geoff

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'81 300SD ---> '46 IHC Metro (some day)