Finished building a hive lift for double hive pallets, so far it seems to work, have made a few design changes from original plans but it does work. I am using it on a trailer as you can see, the swivel is an axel from a 4by4 half ton the knuckle is made of two 1" bearings. And everything is manual leveling. Ian S i really like your machine but i have only 28 hives and only plan 100 or so , Thanks for all the help and emails Ian. Here it is
lift1.jpg liftlevel.jpg