I'll say YES to having an extinguisher.
I've actually had the joy(?) of stopping two vehicle fires way before they got out of hand.
On one I was working in a bicycle shop as young man, woman comes in screaming "My car's on fire!". Walk outside (w/extinguisher) to see little licks of flame coming...
I was under the impression most tires had the lightest spot marked...
I work on motorcycles, and virtually all tires with the exception of Michelin are marked.
That said, if I spin it and it asks for a lot of weight, I will frequently re-orient the tire on the rim to lessen the amount of...
BrianT has that right.
Take a good look at that Ebay post.
Then contact ssandafx.com for the whole lowdown on what's involved.
There is no question that they are the premier builder of LO23 clones.
Real ones will cost more...