has anyone used max jax for engine out service?http://www.maxjaxusa.com/
Looks interesting, but there is no way I'm getting under or around a two post lift that is not securely fastened to the floor. If that thing tips over, your dead. The idea is a good one, and I'd be more enthusiastic about it if it had legs that extended toward the front and rear of the car to stablize it, and one on the inward side too. Something to spread the load and prevent any possibility of it tipping over.
This unit does bolt to the floor. The idea is you can remove the bolts and store it, or move it to another location if you desire.