Maybe...it can be a tough job....but you might get lucky.
On a previous trailer I was able to snake a new tube down through the hole from the inside of the frig and was able to grab it and pull it down between the back of the frig and the trailer wall...
You will have to be creative..
Good luck with it.
Check this out...it might help if you have this kind of set up...
Replace Drain Hose....LINK