Lippert will not warranty any frame damage from any single point hitch other than the Reese Goosebox. Example: Andersen, PullRite, etc.
I went from a PullRite 2600 to a Reese Goosebox and it is a great ride with zero bucking.
Since you don't have a factory gooseneck ball you will need to get one installed. Your choice but, be sure it is rated high enough for any 5th you may get in the future. B&W Turnover ball is popular.
EDIT ADD: Lippert will not warranty any single point (gooseneck ball) but the Reese Goosebox because they own Reese.