From an old Fire Chief.
As MAC the Fire Guy always taught and demonstrated was that it is too late to do testing, that is see how to open and actually get out of an escape window during an emergency. During a FIRE situation your time is limited to seconds - not minutes.
The human respiratory system cannot take the heat or the smoke for more than seconds.
FIRE is the number one cause of deaths in an RV due to the toxic fumes that fill the unit in a very very quick manner.
The number one cause of FIRE is the RV style refrigerator which is cooled by LP gas. However even though many units now eliminate the LP gas refrigerator there are numerous other causes of fire in an RV and escape openings are still definitely needed to be familiar with and tested frequently so that they will open when needed. There has been numerous documented deaths due to not being able to get the escape openings opened as they were stuck shut due to not being opened at minimum annually.
In many documented cases having a tire blowout on the passenger side of the coach with 3/4 to a full tank of fuel, starts a fire when the sparks ignite the diesel fuel due to the ruptured rubber unprotected fuel fill hose that runs right thru the fender well of the tire. The full fuel tank pours fuel onto the fire that basically engulfs the entry door and eliminates it as an escape route from the coach (middle entry door coach's excepted).
Electrical Bays, Batteries, generator, aqua hot, are all sources of fires due to electricity or fuel.
Having suppression systems in all these locations including proper monitoring type smoke and carbon dioxide units does not mitigate the event but it does give you additional time to exit the Coach.
There is nothing better than actual practicing and being prepared for that event.
You are not going to have time to get into the safe and get your money out.
You are not going to have time to get your medications.
You will be very fortunate to get out, so practice doing so no matter what that practice takes.