In the Oct 17, 2003 issue of the National Dragster I came accross advertising for two more companies doing truck conversions. They seem to be custom shops. I know nothing about them except their advertising but I thought somebody might be interested.
Cobra Motorhomes and Trailers. Web site Cobratrailers.com. Their web site shows examples of several of their conversions, motorhomes and toterhomes.
K & C Conversions. Phone number 605-882-9015. Watertown , SD 97201. They do not list a web site. They have 7 pictures of a motorhome conversion and trailer. The conversions looks like it is a Kenworth T-2000 chassis with the factory sleeper intact.