Face the Model A forward and get it as far forward as you can since you wnat a 60% weight on the tongue to not have the trailer dancing behind you at highway speed.
Brake off and out of gear also permits the straps to do their work. The 5000# straps are good. I wrap the axles and run them to the D-Rings.
I would think that it is to your advantage to have some forward and aft element instead of having the straps directly above the axles as recommended above but I am a trailer user and not a theorist in this matter.
Hopefully you have a four wheel trailer and four wheel electric brakes. Adjust the controller to grab a bit earlier than when the car brakes heavily engage.
Make sure you bring a jack and a spare tire, as you could imagine the grief of not having one on a Sunday, 100 miles from nowhere when you are in a hurry.
I have a tall stick showingg me where to drive to and stop since you have a poor view of the deck when driving aboard.
Happy Trailering !