Over the years, TM took a number of approaches to the emergency exit. Some involved moving yourself tight against the rear wall, at which point the rear edge of the bed would sink and you could tumble out onto the ground. Of course, if there was someone else on the bed, it wouldn't tilt - oops! This approach also required you to release a bed latch, so in an emergency you had to remember to do that.
In later TMs, you had to lift the forward edge of the bed and slide under it onto the rear bumper. But that meant you had to be closer to the fire while you wrestled with it, so again I wasn't convinced.
More recently, TM began using a special rear window as an exit. It was quick and easy, and as far from the fire as possible, but it required that you know know in advance how to operate it, and where the latches are. Aside from the fact that no one ever told me about it, I thought that was a pretty good approach.
Don't get too fancy. The TM is a small space, and if you have a grease fire roaring four feet away, the last thing you want to deal with is deploying a rope ladder. Just get out! A hard landing is a small price to pay, especially if there are others behind you waiting to exit.
Bill