get a piece of wood, put like three cinder blocks under it (so its like 2.5 feet or so.). Ta-da.

Doing an actual backflip is easy, just gun the throttle the whole time. The hard part is landing... to stop the car from flipping you have to blip the brake and time it right.

To adjust the cars movement in air:

Throttle= Nose goes up (backflip)

Brake= Nose down

If you wanna try something fun, put a lip on a ramp, go at it full throttle, as soon as the whole trucks in the air, pin the brake, you should do a front flip.


Disclaimer:

Landing a backflip, or any jump for that matter, with the throttle open (you giving the truck gas) is horrible for your drivetrain.

Practice jumping, using the brake and throttle to adjust the cars pitch, then land with no throttle and no brake.

Cheers.