Any experience with 2020-older Grand Cherokees is not relevant to the conversation. As stated earlier the 2021 is on a complete new platform.
To that end, probably nobody here has ever towed with one.
My advice is, look for the smallest lightest trailer that meets your camping needs. You may need to COMPROMISE on amenities and space if you want to keep your 2021 Grand Cherokee. Yes, the mean old c-word.