TDF89

I recently purchased a 2024 Silverado 1500 which came with 275/50/22 on fancy rims. They look great. The dealership would not negotiate for a less fancy tire and rim set claiming it would mess up the system configuration. I’m pulling a 24 ft travel trailer and fear that these tires with small sidewalls won’t hold up. I would like to sell my rims and tires and purchase new 20” rims instead and get larger tires that will make up for the smaller rims. Anyone have any insight into this or recommendations?