They still make the RA-1s and the TQ’s are not their replacement lol.
RA-1’s are now offered in limited sizes mainly due to the tires being the spec tire for some racing series.
It says nothing on Toyo’s site that they’re made for drag racing. Sure, some people do fine w/ them as a street radial at the drag strip, but some people also do fine w/ all-seasons, so are they drag radials too? I know jdaniels posted that the carcass is the same as the Nitto drag radials, but that doesn’t make the Toyo a drag radial. Several companies have different classes of tires that use the same carcass.