We used round tubes on all our control boxes with a smaller diameter ones fixed in the cab. Cheap, strong and can be mounted where you want
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I have Brocken the screen twice on my raven cruiser with a ram mount on a suction cup.both times it hit the throttle pedal.after the second visit to David king I made a clamp to attach it on the cab frame.still has a ram mount on top for adjustmentHad one of those with a Centreline 220 GPS box - drove me crazy the number of times it dropped off!
Thats the kind of thing thats on it now.