We used a wet sand blast kit to strip our trailer and repaint it. Total time for stripping and repainting was only about 3-4 hours. We used an industrial grade epoxy paint made for the chemical plants. It cost about $125 a gallon but it doesnt scratch or flake and is very resisatant to chems. We did it about a year ago and the trailer still looks brand new.
The sand blast kits are awesome. We used black diamond sand, it uses shards of glass or something and it worked 10x faster than the standard sand.