I've been thinking about it for a long time and I decided to put aluminum pans under the floor of my trailer to protect the underside from water and road hazards. I've been a roofer for 28 years and water where I don't want it is bad
very bad. My idea may be a little over the top, see what you think:
I bought 040 aluminum and made 8 pans to fit in the different frame bays and lap on the frame members, I turned them up on the sides 1 1/2" and screwed them down with 1/4-20 stainless truss head machine screws and to the sides with stainless 10 x 5/8 self drilling pan head sheet metal screws.
The wood frame is attached from underneath using deck screws every 6 inches and before any of this is installed I caulk it down using "Dow Corning 795 silicone caulk"
And here's the underside:
Here's the finished product ready for insulation, wiring and propane piping:
Three days worth of work, 2- 4x10 sheets of aluminum and 350 screws.
Tomorrow I install the tail lite wires, propane piping, insulate with 2" foam board, and cover it all up in prep for some walls.
CONSISTENCY!!!!!! It's only a good thing if you're not a screw up.