I use hunks of microlam LVL beam. I have used these for a long time and they hold up much better than normal plywood. If you make friends with some carpenters/framers when they're building garages and houses you'll be able to get cutoff pieces. Mine are about 12"x12". I keep a bunch in my storage bays. I wouldn't want to wrestle with a piece of steel plate under the rig.
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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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