How can I build a carport type roof over my old mobile home?

how can i build a carport type roof over my old mobile home as it is the roof is not peaked and snow is a danger to collapse, the existing roof is concaved . i don't think it would support another roof so it must be unattached to existing roof i was thinking upright beams standing on the foundation and held together at outside wall with flexible screws of some sort then attach carport type roof to upright beams or is it to far out lol

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