Thank you for all of the replies and the details on it.
It does do exactly as you described, i only had to reset the thermostat once when there was still air in the lines from the propane being off.
the only thing it does not do is run for any length of time if you shut off the thermostat, it stops immediately.
I never let it run long enough to really get hot, i just got the RV and was pretty much testing everything. I had it on for maybe 7 minutes to make sure the air warmed up and there was hot exhaust outside.
I was off on the year, it is a 1984 not a 1987, my friend's furnace just like it is a 1987, i scavenged parts out of his because he is junking the RV and his furnace has a blown motor.
I timed everything on startup to make sure there was a delay after the fan starts up, i don't know a lot about these furnaces and don't want a fire from it.