Most bicycle campers just tow, but there are some that flip, that drop, that pitch and that straight blow up. The new Alpencamper adds another motion to that mix: sliding. The two-wheel towable borrows a trick from larger caravans and motorhomes, using a sidewall slide-out to expand its tiny interior enough to house a double bed comparable to what you'd find in a full-blown camper van – not bad for a little 'drop trailer that weighs less than the average adult.