I do not think they would tell you that just to buy a set of hoops, It is a legal issue. Rubber goes bad with time. I would replace them....even with no cracks or "tell, tell" signs of failure. I tire can go bad at anytime and with age the tire will dry out..you can not look into the tire. Is it worth trashing your car or yourself over 200-300 bucks??? If they tire fails and damages the car and the tire is over 6 years old (the DOT code is on the tire....the last four digits or the date. i.e 1401. 14th week of 2001. Unless it has a triagle beside the 01 then it is 1991. the triangle is a decade marker, used every other. the whole code would look something like w2 urp hyhl 1401) they will not pay for any damage. The more you use the tire now,the quicker the problems will begin to show up.
69 x-11..LS1, 420.88 horse to the tires,750 Holley Ultra DP, Torquer V2, darksides headers, PRC heads, 10.8:1 compression, forged bottom end, 5 speed. 2008 King Ranch F150 4x4.