MIke, I have to dollies that I pull and push into the unit. I load with 8' extensions onto my loader forks. I have refrained from cutting anymore lumber for the kiln, that is over 10' long, tomake loading easier. I place the load on the dollie, to the desired height and pull the first one into the trailer. The process for the second dollie, only I push it in to meet the first load. Each dollie is 54" wide and 9' long; while the units of lumber stay at 4' and up to 10' long.
My intent is to do the same for the second drying unit, when I get it delivered. It will be a 41' sea going refer container. I will need 4 9' dollies for the second dryer.