cordellm, as a point of reference, with the trailer hooked up I have to jack my truck bumper up by THREE inches in order to attach the chains to the snap hooks. As it sits, with no load, the hitch height to top of draw bar is 26". With trailer hooked up, no WD bars attached, it squats to 24". I have to jack it up to 27" in order to catch link number 7 leaving 2 links dangling. When I lower the rig and raise the jack to trvel position the top of draw bar is at 25 7/8"--down an 1/8" from unloaded height.
Yours will differ, certainly, but that might help you have an idea what to expect.