Could a plane land on specialized vehicles if its landing gear failed?
Smaller planes can pull it off, here is video from a weekend airshow somewhere.
http://digg.com/video/plane-lands-on-truck
Bigger planes, that's a lot weight. Even my Cessna Cardinal (4 passenger) could weigh close to 2500 lbs landing, basically a whole nother car on top of a truck.  Maybe a car carrier would be good, longer landing ramp, clear front to fly over if needed.

Jets, that's a lot more speed to match up with.