I oredered an ARE MX topper for my 2018 TRDSPTLB. According to the brochure, it weighs 190lbs, plus I upgraded the windows and added roof tracks. So Im guessing around 210 lbs total. I have Yakima crossbars and towers that weight about 40 lbs, and both fishing kayaks weigh about 130 lbs total. Total weight 380 lbs without gear. Might even throw MTBs in back on ocassion. Will the rear springs and shocks handle this constant weight? If not, please provide suggestions along with parts list. My truck has stock suspension, stock wheels/tires 4wd. Thanks.