On the 2016 sports coach, the engine must be running and the emergency break in park, transmission in neutral. Our system automatically dumps the air before the levelers go down. When we're ready to retract, we turn the engine on, turn on the leveler system and wait for the air to fill before we press retract to lift the levelers. The tricky part is when we start the engine we need to turn "on" the leveler system within a few seconds of turning on the engine or else it will not go on when we are ready to retract. (No clue why and we haven't had an answer to this mystery). We wait for the air to fill then press retract to lift the levelers. With our last RV (super C), the engine had to be off before we could use the levelers.
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