+1 on the metal roofing. My crew began doing this after finding a couple places near town that sell 12 foot color-matched 26 gauge R panels for 5 bucks each because they don't meet a certain manufacturing specification. They cut to size and with the right tools it takes about 50% more labor than vinyl, but it ends up about the same cost with installation as the materials are about $250-300 bucks (screws, vents, roofing, rails) and labor $500 for a 76 foot singlewide (e.g. 2 guys for one day). You still gets dents and dings over time but nothing cracks, and touching up with paint is simple and effective enough.
I also did one home with a very thick vinyl privacy lattice and the labor is less intensive but the materials are difficult to get a good deal, about the same as regular vinyl. Biggest issue I have with this is that not very good for pest control, but ventilation under there is great, which we need in the southerns states.