Oddly enough, I have hotboxed a U-Haul before! We were toting some shit from Boston to Chicago, and, after we emptied it out, I drove it over to a friend's house, and we had a small party in it. He was bitching about how his parent's were fucking nazi pigs and thought pot was evil, so we just parked it outside of his house, and smoked in there all night. No problems whatsoever - it even had some of those lights inside, so everything was cool. Toss a nice sixer of Bud into the mix and everything was great. Just out of kindness, we aired it out b4 returning it.