Instead of guessing on the links (I agree 9 is a good place to start), if you get the instructions that go with the hitch, it will explain how to set everything up by taking measurements while TT and truck are on a flat surface.
Basically the goal is to measure the height of your front wheel well without anything hooked up. Then set up hitch so the height is the same (or as close as possible) when the TT and WD is hitched up. Ultimately getting weights is the best, but that will help you get close enough. Height of rear wheel wells are measured as well, but after you move weight forward with the hitch to reset the front wheels as they were, whatever you get measurement wise with the back is what it is.
Only other measurements (If I recall), is height of trailer tongue when hitched up... that, of course, you need to be level to slightly nose low.
It may not work 'as well' as the high dollar Equalizer, but it works plenty fine for me and is significantly cheaper.
Once you get it set up you will be happy with the performance.
Mike