The Manufactured Housing Forums

I’ve had good luck checking mobile home salvage yards, RV/awning suppliers, and local used-parts dealers, since they can sometimes have older aluminum walkway covers and related pieces that regular stores don’t carry.

Yes, it can sometimes be done from underneath, but working around or under walls, cabinets, and fixtures makes it a much more involved repair, so the joists and supporting structure need to be carefully assessed before deciding on the method.