My notes indicate that the coupler height on my 247BHDS is 18" from the top of the inside of the coupler to the ground with the trailer sitting completely level.
Our trailers likely share the same basic chassis, tire size and suspension so that should put you pretty close.
For WDH set up purposes, I set the top of the ball to 19" on a Husky TS Centerline hitch and the trailer rides perfectly level with the bars engaged.
2017 Forest River Surveyor 247BHDS...
...Tugged by a 2016 F250 XLT FX4 SuperCrew, Shortbed 6.2L, 4wd, 3.73...
...Joined with a Husky Centerline TS 800-1200lbs WDH