I have my first trailer almost finished. It is 16 ft long 8 ft wide and 7ft high inside and is built on an old camper frame. The hives are 20 inches by 24 inches and holds standard deep frames. The hives are 17 frames deep and 3 frames high with a 18 by 24 Plexiglas door on the inside. I have a 36 in walk in door on the front end and a 4 foot walk way between the hives. The trailer is built on 3/4 in plywood with 7/16th siding and 1 1/2 in Styrofoam insulation on sides and top. I have a screened bottom that is 1 1/2 in off the floor and a double screen between the top and bottom hive and a 2 in by 12 in screened vent on the top. I have 12 colones on bees in the trailer at this time to see how they do this winter. I asked lots of questions and got ideas and suggestions from many people but can already see things that I would do different on the next one. I have a 28 ft trailer frame setting here to be cut down to 18 or 20 ft and hope to have it done before spring. The 16 ft trailer has 36 hives and the 20 ft one would have 52 and Im not sure I wont that many in one yard. My main goal for putting the bees on a trailer is so I can move them easily throughout the summer from one flow to another without so much work and by myself. Iv asked the local bee club for some of the more experienced bee keepers to look at the trailer and make some suggestions before I start the next one and the only response I got was its not going to be me so Im on my own. I believe its a good idea for honey production but not for pollination because its not practical to move the trailers long distances as you could with smaller hives on flat bed trucks. I cut a 2 ft by 3 ft window into the walk in door so I could open the window next summer for ventilation and found out real fast that that was a mistake. The bees covered the Plexiglas doors trying to go to the light and I had to cover the window to keep it dark inside. Im trying to get pics down loaded but doing to good at it.