I’ve been offered a very tidy ex hgv 44ft artic flat bed trailer with 5th wheel dolly. The problem is it’s running air suspension and air brakes. Local mechanic said he can convert the brakes to oil easily enough but it’s not worth swapping air bags to springs due to the cost. Looking at it if there’s no air in the air bags then the chassis sits on the axle stops so wondering to just leave them deflated? There’s plenty of clearance on the tyres so they won’t rub. Is anybody else doing this?