The implication was that somehow a fifth wheel trailer had more living space and storage then a similar sized TT. 8 X 30 still equals 240. No trick to actually measure the living area with a tape measure instead of using advertising numbers. BTW, many TT's are designated by their actual box size instead of the inflated figure. 25RS or 18XL means that the box is 25 or 18 feet long. The extra hitch feet are not included. Best thing to do is measure. Those who do not know how to use a tape measure are in for a lot of disappointments in life.