Seems like a reasonable device for what Curt designed it to do...I expect they used standard statics/dynamics equations along with Calculus I/II to develop their algorithms. The onboard computer teamed with their accelerometer take care of the calcs.
Check out their info and vids on CurtMfg.com. Like anything, it will have some sensitivity to design mods on individual vehicles, and some my not be willing to live with the effort required to adapt...but looks to me that Curt has developed a very reasonably priced ($99) tool to give specific info that would otherwise be a hassle (or impossible) to get.
I'm tempted to get one, but don't really want to take my camper off to do the baseline calibration....
2017 F550 4x4 19500# GVWR 4.88's, 84" Douglass Body w/95 gal aux water tank
2018 EC1165