I think you do want to securely attach the cab/sleeper to the frame. Then you would want to mount the Morgan box hard to the frame (I think they usually put some wood in between, check how it was mounted to whatever frame it came off of). That should prevent them from rocking around too much. But, you will also want to use an accordian type rubber boot between the sleeper back wall and the box. At least that's how all the ones I've looked at have done it.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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