Which coil spring will retain the the factory height of a TRD Pro but handle a heavier payload? Isn't the Pro only 1" higher in the front meaning that the rear is the same height as every other trim level? I have a Pro with a 1.5" two-piece spacer up front and a 1" in the rear and it's great under normal circumstances but when loaded down for a trip or with the dirt bike on the hitch carrier out back it sags below level. I don't mind the look of the sag but it points my head lights high and it changes the steering and handling of the front end and that I don't care for. Thanks for any help.