You would have a really hard time convincing me that thing is accurate. If you haven't looked at the website (I did just out of curiosity not interested in buying) I have included it below. I will give them acceleration, that's the easy part. But it says everything else, payload, pin weight and tongue weight simply by measuring the vehicle pitch angle. 1,000 pounds in the front of the bed is going to be a way different pitch than 1,000 pounds on the tailgate.
The only thing you can determine from pitch angle is pitch angle.
Here is their website info: Acceleration is determined by an accelerometer onboard the HaulGauge device.
The rest of the HaulGauge features—tongue weight, pin weight, payload, and weight-distribution—simply monitor changes in the vehicle’s pitch after the scale has been initialized with the vehicle unloaded.
Michael & Fran Dilday (Baxter & Honey 2 Labs)
'18 Cedar Creek Champagne 38EL - '17 Ford F350 Lariat DRW w/Reese hitch - TST 507 Color TPMS - Garmin RV 770 LMT GPS