My 1960 cj5 came with four B.F. Goodrich Trailmaker Silvertown tubeless 9.5-14 tires. Before I got it, the Jeep was last registered in 1985 in the state of California. The tire sidewalls have cracks in some areas. All the tires hold air. My question is what do you think about driving on old bias ply tires? Just short slow trips around 30mph. Mostly want to drive it to a truck show a few miles away. I know that the newest they could be is 1985, but they may be older.