With my Parkit 360 I had to use a rubber transition ramp to get over my surmountable curb. Even then it was a struggle as the Parkit did not have sufficient power to go up the curb. I ended up using the tow vehicle to pull the trailer tongue up onto the driveway a sufficient distance to where I could disconnect and then place the Parkit onto the Airstream. This solved this problem.
As far as the difficulty in turning the unit, I found that I could only safely turn it while it was moving. As I was learning this meant some back and forth. But after awhile I got better at planning the line I would use to move the unit and now I almost never have to turn it while stationary or do a log of jogging back and forth.
2017 25' Flying Cloud
2018 F-250 6.2L Gas
Blue Ox SwayPro 1000#