I can't find any real information about this truck but here's what I can tell you. The 'CAT' stands for "Climb Action Traction". This was Remco's buzz phrase for a motor they devised which climbed over just about anything at a snails pace. The same gear ratio was miniaturized and used in their Mighty Mike Jeep & Truck series.
Fat Cat is a big hunk of plastic I would guess about 2 feet long. If you add the big orange plastic winch in the front, it's longer than 3 feet. Finding a Fat Cat with the orange extension in the front and a working winch is no easy task, but when it's all there, it sure is an impressive looking piece of plastic machinery.