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Except for the keel stringer, which is a glass encapsulated 2x4
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Just a bit of information
My '78 had a glassed in 1/2 of a 4" PVC. The wood keel stringer was used in the earlier years to beef up the keel due too center roller trailers which were commonly in use before 'Float on' type bunk trailers. I don't know what contruction methods were used in the later 80's ?
Below pictures show the PVC Center stringer before & after I removed half of it.