I forgot who asked me for info on the seam tape so I'll post so everyone knows....The tape they use to adhere the aluminum siding to the steel frame on the screwless trucks-trailers etc. is called "3M VHT"....it's a two sided tape that once you slap the aluminum on it its over with....the stuff is tougher than monkey snot-and that's tough!....was out looking at my new trailer being put togeter today-will go again Wednesday so if anyone has any questions let me know-I'll nose around....geof