What TruckX does publish
The accessory pricing is real and specific. On the two-channel dashcam: $4 a month for live GPS only, $10 a month for live video plus GPS, $10 a month for an extra driver-facing camera, $10 a month for insurance APIs, and $49 for a 128GB SD card.
On the four-channel Pro: $5 a month each for ADAS and DMS events, and $3 a month for an extra side camera.
Sensors are $29 of hardware plus $49 a year each, for both the temperature and humidity sensor and the door sensor. These are the numbers to build a comparison from, because they are the only ones TruckX actually states.