Has anyone found a class 4 or 5 receiver hitch for the 16 yukon? I know they don't make an aftermarket one but didn't know if there is a good one thst I can modify slightly for install. From what I'm seeing, it comes from the factory with a class 3 but I'm looking into a bigger boat at around 7k pounds or so and needed a heavier receiver. From what i've researched, the factory one is only good for 5k.