Eagle 5 is the 1986 Winnebago Chieftain 33 that heroes Lone Starr and Barf travel in, using it as a flying spacecraft (with space engines and wings attached). They use it to rescue Princess Vespa.
Being the largest Winnebago produced in the mid-80s, filmmaker Mel Brooks used a full sized vehicle for some shots but relied on a 1/12 scale resin model for the majority of the filming.
My drawing is 11’x14” marker on paper. Prints are available through the links at the top of this article and on eBay or Amazon.