Looks like an old water damaged and quite neglected RV. RV's don't do well when not maintained, and even when they are maintained, the way a lot of RV's are built nowadays, they're destined to become pieces of junk inside 10-15 years.
There are good high quality RV's out there, both trailers and motorhomes, they're just not cheap.
Anyhow, I'm sure this guy will make way more off this YouTube video then he ever could have trying to sell that crate.