How to tow an early A?

ANY vehicle has enough caster to tow bar, if the front end is in fair shape, if it's aligned, and has "some kind" of tires that are aired up. Not having an engine might just be a problem.

I don't like to towbar, you have no brakes on the "thing" which probably weighs as much as the tow vehicle, and if you EVER got into a situation such as...............

going down an unimproved road, IE dirt, raining, and you MUST slow, the rear unit can start to push and jack knife the front vehicle.

In this day and age of heavy traffic and impatient drivers, a towbar has no place, specially on the highway.

Use a dolly at the minimum, or buy / borrow/ rent a trailer. I bought my first car trailer in the early 70's in San Diego. I just recently got rid of the thing and bought a nice used one for 1200 bucks.