I ran one of these for a couple of summers back around ‘79 and ‘80. This was in CA in fields near Dixon and Davis. It was a lot of fun and a lot of work! The model I operated may have been a 1068 or 1069.
I'm not sure about the unloading height. Roading it's 14'2". Used it a lot for a year, but no ground to work the last two. One upgrade that was worth it's weight in gold was swapping the Holley carb for an Edelbrock