I have a 2018 Ulterra and have used it on spot lock at the dock, both unloading and loading. I have never had an issue, but there is a first time for everything. Not sure which remote you have but mine shows when it is spot locked. The remotes are sensitive and if you bump a button it will change the command. I constantly look at the remote while parking or retrieving the truck to load to ensure it’s still spot locked. On the flip side about a month ago I decided to use cleats and a stretchy rope with built in loops for the cleats. Came back with the truck to put the boat on the trailer and the boat had floated away from the dock. Of course I had shut the power down on the TM, left the remote in the boat and taken my life jacket off. I swim like a rock so that was not a solution. Luckily a life ring with a rope attached was on the dock. I was able to throw the ring in the bow and slowly pull the boat to the dock. I won’t be shutting down the power to the TM anymore and I will have the remote with me when parking or retrieving the truck. Guess bad things can happen regardless of which method you choose. Glad it worked out for you in this instance.