While you might think the Burro is rare, most of the parts are the same one used in hundreds of brands of RV, so they are not rare at all, and parting out would not be financially beneficial.
If you got it cheap, you can either sell as is, clean up the dirt but nothing else. Chances are you will make good money on it. Or you can fully restore. To restore, you need TIME and a dry place to work. I love projects, but sometimes its better to sell as is.
Be realistic about the time commitment.
I bought my 1977 Trillium
from a guy who bought is as a project to work on. Twenty years later, and he still hadn't worked on it, so he sold it as a project. Sitting next to it was an old VW beetle, that he bought to work on. It had been sitting just as long.
This guy had a nice two car garage, which was full with these two projects. He surely would have benefited from that garage space for family vehicles instead.