B+ motorhomes

I drilled thru the floorboard of mine inside the cabinet under the sink to run an electronics cable to the rear for one of my gizmos and found that the plywood had an aluminum sheet sandwitched between the two layers. Also had a layer of "tar paper" or felt. Took quite of while to cut through. The aluminum surprised me as I don't remember seeing them use sheet aluminum when they built the floors on our factory tour last year. It may have been the flat side of one of the aluminum tube or angle which they used to build the body panels or because it was near the power distribution center and had additional strenghting. Even though I spent a career around combat ships and aircraft and was use to heavy duty construction meant to take a beating, I was impressed at the solid laminated constuction that the folks at R-Vision were using to build the units the day we were there with the R-Vision Camping Club ralley. RVs are a lot tougher than they look.