Also, fix the air leaks! It's costing you fuel to pump that air!!!
But, he's right. That compressor is costing you fuel, too, every time it cycles it puts a load on the engine, so fixing leaks will save you fuel in the long run.
You can remove anything that's not needed like the door opening mechanism. If I understand correctly you originally had an air operated split door. If it didn't, then you might be talking about the claw air lock, as mentioned before.
There may be some unneeded lines in the rear, also, that were used in the coach bathroom. Be sure to check your regulators, cylinders, and also hoses with soapy water if you really want to track down all the air leaks. I've seen air leak from the middle of braid covered hoses, and it's not uncommon for regulators, cylinders, and skinner valves to all leak.