I had a 33 foot travel trailer with no ladder. I took it to a dealer to see if they could add one on. They said no because there was no structure in the end to attach the ladder to except the sidewall and lamination which would not hold the weight of a person. The only way to find out would be to take it to a dealer. They would know. The problem with a lot of the light weight trailers is they do not have the normal studs at every 16 inches. Good luck.
I ended up buying a compacted ladder and brought it everywhere I went.
Philip, DW, 3 DD, 1 DS, and Kadie our Dog
2013 Flagstaff V-Lite 30WTBS
2003 Ford Expedition 5.4 Liter with 3.73 Axle
Equalizer 4-Point Sway 12000# & Tekonsha P3
48 Days of Camping Reserved for 2012