1.5. The most admissible towed freight, the trailer with brakes

The most admissible towed freight is specified on the plate on a curved wall This parameter it is possible to calculate on a formula.
The towed freight = allowable gross weight - an allowable weight of the car
 1 - Car model
2 - Number of the chassis
3 - Allowable weight of the car
4 - Allowable gross weight
 5 - A permissible load on the forward bridge
 6 - A permissible load on the back bridge