I think the OP said he was going to use a second tank where the line runs into the shop and if so this should greatly reduce any problems with incoming moisture. If the air is routed into the second "thump" tank first and then a line is taken from the TOP of this tank THEN plumbed into the separators he should have a really decent air system without major moisture problems. This tank should not be more than about 10 gallons or so depending on compressor CFM to prevent excessively long recharge times which would not be good for the compressor.
[EDIT] I just checked back and I don't see where he said anything about a second tank, don't know where I got that
, but it would help. It certainly would not be necessary however since there are several "right" ways of doing this that should be equally efficient.