Unfortunately I've seen boats fly on US 40, US 50 (more than once), I-25 and I-70. Fortunately I have never been the one to lose said boats.
From the Jeep's point of view, I can imagine myself being pretty pissed at having to dodge flying boats at interstate speeds. Add to that watching the clowns not pull over immediately, but instead go around to the next set of exits so they don't have to walk back a half mile. I could see how someone might want to try to teach a lesson.
Not saying they deserve to lose their boats, but I suppose they'll never fail to tie down their boats ever again.