Cost Effective Roof for older flat roof Mobile Home

[Celeste Fackrell]

Good morning all.

I have an older Mobile Home that I have remodeled and has been a great money maker for me.  It is a flat-roofed model and I want/need to replace the roof.  My park is in an area that occasionally get 15"-20" of snow.

My options seem to be:

1)    Just add an EPDM membrane to the existing flat roof.  As far as I can tell this is the least expensive option.  That said I still have 2 problems, the roof is still flat, and I'm not sure about the durability of a flat EPDM roof.  Obviously flat works, am I making more of an issue than I should?

2)  Build trusses, with a slope, sheet the trusses, and add metal roofing.  Good option but double the cost of the EPDM.

3)  Build trusses, sheet the trusses, and shingle the roof.  This seems to be the mid-point price wise, however, will an early 80's trailer (in average shape structurally) support the weight of the trusses, sheeting, and shingles?

Any other good options I'm not seeing?

I'm looking for the biggest bang for my buck; need to get another 10-15 years out of the home.

Thank you in advance for any feedback.

Sam