As I have no idea what unit you have, but my guess is that you have a travel trailer. I think the second door is the second exit, used in case of fire. Furthermore, I believe having two exits, albeit a door or an egress window is required. I may be wrong though!
Goody Two Shoes and the Filthy Beast
2008 Silverado 2500HD
2012 Wildcat 282RKX
You cannot make things idiot proof, you can only make them idiot resistant.