2003 U320 Build# 6147<br/><br/>How can I energize the chassis air tanks from shop air?<br/><br/>I have tried the accessory air connection in the propane bay, It appears that the the air is intended to travel out from the air system, maybe not IN.<br/><br/>I would like to be able to air up the suspension from dry, regulated shop air...<br/><br/>There really isn't room to add a fitting to the drivers side,...