Okay big hole on side of trailer...mmmm neighbor came over and asked what I was going to do with a window that big ha! got ten hours in yesterday (sat) lot's of progress as you see, today RAIN !!! I picked up 5 nice urethane rollers 3" wide with bearings installed, although not sealed, thinkng they'll work real nice,for the wall threshhold, was checking out HWH websight they have tons of info, think it's like HWH industries, got a few more pics to add