RV Fire Exit (aka exiting Dukes of Hazzard style)

Feet first: Sounds good but a rather awkward thing to do. As others have said, a fire licking at your heels is a good motivator but only after trying to get out the door.

Fire extinguishers: The factory supplied ones are fine. You need to take them out every few months and rotate them. If you can't feel the material inside moving a few raps with a piece of wood on the bottom will usually break the contents free. Only if you can't get the material to move do they need to be changed.