Is there any wood or sprayed foam in a travel trailer door?

http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/25185116.cfm

Also, there are many youtube how-to videos to show you how to re-skin it, patch it, replace it.

if you have glass in the door, do yourself a favor and run a bead of caulk around the edge of the glass. I have seen many doors allow water intrusion in this area. Over time, sometimes it can also lead to a soggy trailer floor.