For fifth-wheel trailers, it will be the actual pin weight. • The rear-axle weight of the truck, to determine if it is overloaded. • The front-axle weight, to deter- mine if too much weight is on the rear of the tow vehicle. With a travel trailer, this may mean tightening or releasing the weight-distributing spring bars a bit. Nov 06, 2018 · How Much Power Does It Take To Move a Loaded Semi? Getty Images A Detroit Diesel DD15 14.8-liter inline six-cylinder engine weighs 2,880 pounds, or 345 pounds more than a Mini Cooper.
Typically a tensioned chain produces the rotational forces or torque. For the tow vehicle, the chain pulls up on the weight distribution bar. This results in a reduced load on the vehicle rear axle and an increase on the front. For the trailer, the chain pulls down on the tongue which increase the load on the trailer's axle.