Airing up the system is the best idea. However, the rear start switch bypasses the neutral lockout on the transmission and will allow you to start the coach in gear. This is something you want to avoid, especially on a ramp. The only thing holding the coach from moving forward is the spring brake on the drive axle. At an idle is 'should' hold the coach BUT if it is out of adjustment you could be looking at some serious damage and potential injuries. Even running at low idle, it will take a while for the air system to come back up to 60 psi where things will start working again however, at about 60 psi the spring brake will release and you could be in worse trouble.
It will take a while but air up the system with an external air compressor. Don't try to do it with a 12 volt pump. You need a decent 120 volt air compressor to avoid spending the day adding air. The fittings in the engine compartment (passenger side) is a standard quick connect fitting that you can get at automotive stores or home improvement stores or hardware stores.
The answer to the question about shifting the coach into neutral is 'yes' you can but again there is danger so be sure the coach is well supported so it can't drop on you. Just because the air tanks are empty doesn't mean that there isn't still air in the suspension system that could deplete and drop the coach on you. If you have either a manual shifter (like Tom) or an air shifter (like mine) you can release the coupling to the shifter on the side of the transmission (again passenger side) and manually move the shifter into neutral. Depending on the way the shift mechanism is mounted you have to either pull the mechanism all the way out or all the way in to get reverse, then move it one gear to get it back into neutral. Not really for the faint of heart.
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