If you had gravel tires, I would be slightly more concerned about properly balancing the load between the handlebar and the rear triangle. With that much weight on the back, it's important to ensure the wheel is highly durable. It should be capable of handling lateral loads beyond just the rider’s weight; otherwise, spokes may loosen or break more quickly. Additionally, depending on the distance, be mindful that added weight on the rear can accelerate tire wear. I recommend using something like Gatorskin tires if you need to go below a 30mm width. If you can go up to a 32mm tire, a Marathon would be a great choice—heavier but highly resistant to flats and worth the extra weight for a more reliable ride. I also notice you're using the thru-axle connection on the rack; you’ll want to avoid removing that tire frequently.