Hi, newbie here. I have a 2009 Patriot, 2WD with 5 speed manual. I tow a 16ft boat on weekends and find the rear springs sag too much. I'd like to swap out the rear springs for something heavier. I do NOT want to lift my Patriot. I like the stock height. Does anyone have suggestions for a source on custom made springs? Air shocks or helper springs? I've looked around myself on the internet but haven't found anything yet. I was hoping the collective group here could help me out.