DekraTex is not an epoxy, it is an Aliphatic Polyurea.
http://polyfloorcoating.com/
Material cost goes from .50 a sq ft up depending on color, design etc. I did one job with it, try to post pictures later.
Coating
This is not a Trailer but a Van my friend did himself. He sprayed the walls with foam and the floor with polyurea. He bought a kit on ebay to do so.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&item=180337088083
I have not seen it but he loves it.
Coating