The majority of these images we found off Fiberglass RV and after removing the moldy interior framing that came with we decided it would be best to use thicker wood even if it means we will loose an inch or two on the interior.
A lot of the comments we have seen describe doing a floating framing structure on the inside so that it has some wiggle room to allow for the vibration that will be felt while in transport.
There are more suggestions on how to push out the roof if yours is concaved from the weight of snow like ours. We did this by rigging two jack-alls with 2x4 to push the roof up a bit at a time as to allow the fiberglass to stretch back to its original shape. Take a look at how our interior framing is coming along on another page.
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