Bruce, glad your with us, and welcome to "Happy Family". And no, not a Chinese take-out.
Always fun to mess with the trailer.
Final adjustments show you've accomplished the first 90%. We can all relate to that.
Forget worrying about the canvas at 55 mph. Bungee cord/cinch it down as best you see fit. With good forward thinking things should be fine.
Any questions, ask them. You have friends here.
Again...Welcome aboard Bruce!
And ps....Seabob on this board made your boat and be assured, delivered a quality product. With regard to the hatches shipping a bit of water...they all do. Don't be concerned with a spoonful. My 1975 22-2 was subject to 23.75 inches of rain in 3 days. She was tilted well stern-down on the trailer. Opened the hull drain-plug yesterday, final turn the plug blew off down the ramp. Drained for 20 to 25 minutes or so. Estimating eight to nine hundred pounds of water held in the bilge.
Are my stringers waterlogged? After 35 years of course they were. Now....well....at least no bugs in the bilge....