Rented a 19 foot airstream last weekend for a short trip up to the eastern Sierra. Well within the towing ability of my stock 2016 200. It towed well but the rear end on my 200 was sagging badly. I didn’t have a weight distribution hitch. My question is whether I should invest in airbags, weight distribution hitch or beefier suspension? I’ve done some backcountry camping without a trailer and when fully loaded the rear sags badly also. I’m planning many more trips with my 200 and just want the best set up possible; not necesssarily the most expensive.