The core structure inside our Bigfoot
doors is poor.
Remove door from trailer. The screws in the 4 corners hold the aluminum frame together.
Removing the lockset is easy. 4 screws on the interior face.
When the corner screw are removed the frame can be pulled apart.
The outer, and inner faces my have contact cement holding them onto the foam core, carefully using a long metal spatula or long thin bladed tool you can peal the face coverings off. Mine had been glued on very poorly. just about fell off.
The wooden frame that surrounds the foam core is held together at butt jointed points of contact with corrugated fasteners.
Vertical frame parts are called stiles. Horizontal pieces are rails. The rail and stile pieces on my door at the top and thru the lock structure were good. the bottom pieces were totally rotten and were soaking wet mush. The stiles were rotten up about a foot.
I am a cabinet, furniture maker; I made up replacement pieces. Screwed the new frame back together with stainless steel screws. Used the OEM foam.
I drilled holes in the aluminum frame bottom facing edge, of the bottom rail, so that water could have an exit point.
When water is sprayed against the face of the door it goes between the fiberglass face, and the aluminum frame, to the bottom and collects there. I didn't caulk the edge of the aluminum frame where it meets the face. I guess I could have done so.