[Rusty Davenport]

I think you would be better with an "E" range light truck than going the trailer tire route. Just check the load rating before you purchase them.
I used to carry 3 spares when I was fighting all of that 15" stuff. I did not see anyone add 95+ degress in August to that 75 mph insane road speed. I'm telling you as a racer friend-----15" tires at 75 is only a death wish. You have been very fortunate.
Go get a home equity loan and get the 16" wheels and E range tires----road speed heat buildup is what kills tires and you and maybe someone else.
I finally listened when I did the 15" thing----I remember a Denman tire was very good-----then I lost one until the spares were gone.... then I bought a tire at every exit on I-95 even car tires if they had one. Please get the 16's and rest for the race.