I would definitely see it in person before even considering paying money for it. But since you mentioned it, I did a reverse image search and found an older ad with more of the same trailer in Michigan, not Miami.
1968 Airstream Overlander for sale in Linden Michigan - United States
Good to know my instincts were correct when I identified the outside shot as an Overlander!
Can a mod edit the title to say something like "Possible scam: 68 Overlander Miami Craigslist"?