The left wall production drawing I have for my 2015 Vegas 24.1 shows the floor is 1/2 inch plywood on 2" x 1" hollow aluminum tubing as blw2 noted.
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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