I've had 2 steps on street vehicles and there's really no practical use for it
BUT at the track with the right set up, OH YA!!!
I had a Brand X Race Truck I recently sold to a good friend and it had a 3 step I used as a 2 step. 418 cu in 351W w/ 13.2:1 Compression, C4 w/ Brake, 5500 RPM Stall, 4.88 Gears with a 3000 RPM Launch Chip & 8000 RPM Limiter Chip.
It goes against everything you know the first time you roll in and push the Trans Brake Button and take your foot off the brake pedal while pushing the go pedal to the floor. But when you let go of the button holy someone hit me in the back of the head with a baseball bat