Tires definitly need to be supported full width (+). Here are some simple built up supports I use. The one pictured is for the duals. You can make them any height/width you want and use your scap wood. The plywood top won't crack like a 2x12 and they are much lighter in weight as well.
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Rick and Lynda Smith
2020 JAYCO Eagle 30.5CKTS
2018 RAM 2500 4x4 Crew, 6.7L Cummins Turbo Diesel
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