Hauling a 4-door Jeep behind a Sunseeker or Similar?

It looks to me like the 32’ Sunseeker has sufficient towing capacity if the numbers from their website are accurate. 22k combined versus 14.5k GVWR. I didn’t see what the unloaded weights were but I suspect you will find with five people (albeit 3 are small) with full fuel, full water, everything you need to take with you, you quickly get to the GVWR. If you can find one for sale ask to see the sticker that shows the weights, tire information. It should have the information you need.