In April, I measured one of the three existing 22 footers. I only took inside measurements. The usable interior length is seventeen feet, eight inches. This includes about thirty-six inches in the front bathroom. The battery
box is mounted directly over the driver side wheels (well placed to counteract the excessive weight
that is usually found on the curb side of FGRV's). It is large enough to hold any two 12-V batteries or four 6-V batteries.
The unit I measured was the twin bed model. The beds were 32 inches wide and 76 inches long.
The new versions now come with very quiet ducted basement heat as standard equipment.