Here's my limited experience with tires on my current Model A:
1930 Model A coupe purchased in February 1977 with five (5) 4.75/5.00/5.25/5.50 x 19 Bedford 4-ply Nylon tires with tubes. In the interim, I have put 15,700 miles on them in Idaho, Washington and California, garaged and non-garaged, driving in everything from snow (with chains on the rear tires) to dirt, including freeway driving, daily driving and a several-year period of non-use punctuated by a 9-month period when our son drove the car daily to high school. How many miles were on the tires when I purchased the coupe I can not say (nor can I remember exactly what they looked like in 1977) although judging by the attached photo, it probably wasn't many.
These tires were probably rotated 3 or 4 times in the 36 years I ran them, spin balanced twice and had no flats. I ran them at 35 psig.
After the car was purchased in 1977 as a (more or less) basket case, I installed new king pins, tie-rod ends, pitman arm/drag link connectors and after-market reproduction shock absorbers. Last time I measured, the caster was 5 degrees (+/-), camber was +3-1/2 degrees and the toe-in (which I periodically adjust as needed predicated principally on the amount of "wander" on what passes for paved roads in this neck of the woods) is about 1/16". The tires wore more or less evenly (there was about a 1/32" difference in the center-to-outer tread depth when I replaced them) and there was no sidewall damage other than minor crazing (certainly no cracks).
Last year I replaced the Bedfords with a set of 4.75/5.00-19 "Made in Vietnam" Lucas tires (blackwall for you purists) using new tubes on a different set of 19" rims. So far so good, especially with regard to the new tubes that haven't leaked air or otherwise been a problem. A couple of weekends ago we drove the A up to Middletown for their 1930's days (about 100 miles round-trip by the time we got done) and stayed on the back roads (which definitely had a 1930's flavor, that is, they didn't appear to have been maintained since 1930). As bumpy and pot-hole ridden as this road was, the tires held up well and we experienced no problems, coming or going.
Now we'll see whether the Lucas tires - or I - last another 36 years or 16,000 +/- miles, whichever comes first...