Assuming this trailer was really used as temp housing for a worker that was away from homebase,then we can probably make a couple of general guesses. The good news is it's almost new, so how much really "could" have gone wrong or be damaged ? The bad news is, it's unlikely it was "looked after" well. Face it, this guy was working long hours, and just needed a place to come to in the evening to shower, eat and sleep, so he could get up the next day and do it all again.
So, it's likely that there could be some things, like has already been observed that make it something of a project trailer. Which is fine as long as it's bought cheap enough, and the buyer is willing to either pay for the repairs, or is able to do them herself. Anything can be fixed, all it takes is the application of time, effort and money. Only the buyer can really answer whether she wants to mess with it. But again, as always, it really comes down to buying it for the right price.
She needs to look at it at least somewhat, as a business transaction, and as such, with the emotion out of it, then it either makes sense, or it's time to walk.
If it were me buying, I would lowball the seller, agree to take it as is, and plan do the repairs myself.
It's a buyers market out there.
