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R model mack air tank mounting

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Hi guys,

I am in the process of restoring a 1983 R model mack. I have the chassis completely stripped, we have split the chassis rails and sandblasted everything and we are now in the rebuild phase. 

My original air tank mounts (there are 4 tanks) were horrible looking bits of angle iron bolted to the outside of the chassis that looked very second rate. I can mount the two smaller tanks inside the chassis rails, but am looking for a way to mount the bottom two larger tanks in a way that looks tidy. Does anyone have any ideas on how to do this? It is a 688rst long wheelbase tipper and air start.

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Those angle irons were factory.

Truck we just bought has a pretty large tank that uses brackets and straps similar to how the fuel tanks are mounted, plus the two smaller tanks in the frame rails that supply the lift axle. It's a  1988 r690s.

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