Check out how toolbox folding shelf's work.
Remember a 45* angle is the same lenght as its wide,
Pull up table,support "falls" down(maybe 2in narrower than inside length) and stop before table goes past 90*
2 pc's of 1/8 alum/steel triangles 1 on each end(the tops would be level and sq. To bus side) with piano hinges and 2 solid stops each wouldwork great.
Basically you would lift table top up aboute 1/2 past level,swing out the "wings" from the bus and set the table top onto them.
Since the bottom of thed table top would have 2 "blocs" attatched to the bottom with a little more than 1/8 gap, it would be secured and level when you "drop" it down.
Did that make since?
If not I can try to break out mycrayon next week when I get back