There's some incredible helicopter video from that tornado, likely lost in a news studio somewhere. I saw it on an old late 90s/early 2000s clip show called Real TV. The footage was almost Fridley, MN like, and I wish I could find the full version of it. There is a quick clip from the aforementioned footage at 2:05 in the video below, however. Also, the 1988 Denver F3 produced some pretty impressive vehicle damage. Check out the mangled car at 3:05!Never heard of a landspout being a violent EF4 or EF5 tornado, but I did read in a PDF that the 1988 Denver F3 tornado was a landspout. Not sure if that's true though.
edit: Here is the PDF