Meriachee;
You are so correct about power boaters and the funny thing in many cases they take more time. Once I had a customer who needed my help one weekend at an active ramp. Drove for a couple of hours to meet him as it was his first time since I trained him. He never added anything to that ballast as it had sat in the water for six months. Mr. Power boater who was fourth in line came over using a lot of cuss words. The 260 came onto the trailer nicely with the vents open while the jerk was standing by and cussing still. Pulled the trailer up a little to let the ballast drain which takes only 2 1/2 minutes. You guessed it the ballast stunk to high heck with the cusser running away. I laughed telling my customer to add chlorox next time. I always suggested to train yourself at a ramp during the week with no one around as you wish not to offend others particularly not on the weekends dying the season.
You are correct about momentarily partially filling up a tank while the boat is on the trailer due to safety margins built in but also over the years as a very active dealer I got to see alot that most of you never saw which i did as a dealer repairing those boats. Once in a conversation with Olaf Harken, he too erred on the side of safety but concurred sailboats have rights to at the ramp agreeing with several of us training for launching should be done on less active days regarding launching and training.
By the way I have drained like you in the parking lot next to an impolite power boater. I got a good chuckle out of your comment ha ha