Jared, I would put that closer to a $3000 trailer.
A couple thoughts:
The tires are now at least 4 years old, so will likely need replacing. They also look like car tires, a no no.
Unless the owner can show you that something works then assume it doesn't. Cause it won't.
The smaller Streamlines are harder to find, and will be worth more when finished. But starting in 1968
they used anodized aluminum, so they can't easily be polished to a mirror finish without first removing the anodization.
Good luck, check out the Vintage Kim section for more help.