The bike is from Bike Friday, aka Green Gear Cycling, located in Eugene OR.
www.bikefriday.com
(Pretty close to Corvallis, call them for a tour and test ride.)
They make all kinds, styles, and prices of folding bicycles, and they concentrate on quality, durability, handling. You can buy cheaper folders but you'll never beat the BF combination of performance and reliability. Their logo is "performance that packs" and it's true.
My Tandem XL model is somewhat higher-end in their line, and the cost was about $3000. My wife and I are avid cyclists, so we go for the best we can afford (or a bit more hehehehe). The basic Tandem sells for just a bit over $1000. You'll see from the web site that they offer LOTS of choices.
As far as I know, nobody else makes a folding or take-down tandem in the small-wheel (20") size. Many, many tandem-makers offer S&S couplings, where the frame actually comes apart. However, I do not know if these full-size bikes can be made compact enough to fit in an RV, because they all have 26" or 27" tires and wheels, which are very difficult to deal with.
And yes, the gearing is made to accommodate the smaller diameters, and no, you don't have to pedal any differently. The BF bikes are geometrically identical to full-size bikes and ride as well.
If you get over to Bike Friday, ask for Dave Siebert and tell him I sent you. He's a great consultant and has helped us repeatedly over the years.
G.