I believe they were COOPER DISCOVERER AT3 4S 275/60-R20, OR A SLIGHT VARIATION, I just put 4 new COOPER RUGGED TREK on it a couple months back because the others were not available at the time and information indicated they had been phased out. The RUGGED TREK are a much more aggressive tread design but aren't too bad for noisy but they affected my fuel mileage negatively, 2-3mpg loss, my rig is 4x4 and does get used some so I wanted an all terrain tread, I think I've had 3 sets of the AT3 4S and have had good luck with them, they wear well and hold their balance, the last set wore out a little quicker because they didn't get the rotations and balance as often as they should have due to COVID & my wife's cancer treatments, in fact they were only done once in their lifespan. We bought the truck Dec312019 with 14,344 miles and had to replace the original tires due to an impact fracture, I put 4 new COOPERS on, my wife was diagnosed in April, between early April and early Nov we had put over 20 K on the truck, I got another 15 0r 16000 miles, the tires still had plenty of tread but I got pissed off at the tire dealer because I had a VERY slow leak in the left rear tire, we went in for a flat repair and rotate & balance, apparently rotating and flat repair was above their intelligence level. They couldn't find the leak, I even made them prove to me that thetire wasn't leaking, and they were right! It wasn't leaking, but they hadn't rotated, they put the leaky tire right back on the left rear, I just didn't realize it for a week when I noticed the wear patterns. I like the my tire retailer because they hand torque every single lugnut, but I may be switching if I can save a few bucks, the RUGGED TREKS set me back 1500 smacks after mount, balance and warranties, they don't miss a beat, but they've been good when it comes time for warranty issues too.
JUST SO YA KNOW, YOU MISSPELLED MY NAME! IT'S CAVEMANN! LOL! You see MANN is my last name. The name CAVEMANN was given to me by our High school football coach. I've carried the nickname since I was 15, I'll be 68 next month.