You can purchase pre-made cabinets and install them as you would in any framed home. Anchoring the weight to the studs in the wall. I have done this several times when renovating manufactured homes we rent or re-sell. If the shelving is not in bad shape you might want to consider just replacing the doors and painting the rest of the existing cabinet system. We have done that several times with outstanding results.
You can find some of the parts you may need at the Mobile Home Parts Store
Look at the links in the blue area on the left side of their pages
under Cabinets & Hardware.
If your a Do-It-Yourself type looking for a good book that covers repair and upgrade techniques specific to manufactured homes, visit our book store and look at The Manual for Manufactured Home Repair & Upgrade
The purchase price represents a small fraction of what you would have to spend on contracting out repairs.