I recently asked etrailer.com a similar question. My soon-to-be-delivered Cougar 32RLI has an unloaded tongue weight of 1165 pounds, and I am trying to determine which Equal-i-zer hitch to get. Here was their response to me:
"The weight distribution kits for the most part work in a range of weights. For example, the Equal-i-zer 14K gross & 1400 lb TW kit (part number EQ37140ET) has a tongue weight range of 1000 to 1400 pounds. This range is listed on all of our weight distribution product pages under "Specs", unless the kit you are looking at is a low capacity kit. In that case it will give a maximum tongue weight spec only. For this 1,400- Equal-i-zer example, the bar will begin to spring at 1000 lbs and it can break after 1400. When the bar springs, it is doing its job (distributing the weight up your tow vehicle frame and down the trailer frame). Ideally, you will want your actual loaded tongue weight to fall right in between whatever the listed tongue weight range is. For this Equal-i-zer kit, you would want to achieve the closest to a 1200 pound tongue weight as possible, even if that means rearranging some weight in the trailer to help facilitate this goal. If you can reach the middle of the tongue weight range, and the kit is properly installed, it will perform to the standards the manufacturer intended it to for you and you will be very satisfied with it!"