Auxiliary dolly

1. An auxiliary dolly attachable to the rear of a primary trailer, the auxiliary dolly comprising:

a first portion attachable to the primary trailer, a second portion comprising one or more axles with wheels, and a pivot point at which the first portion is coupled to and movable relative to the second portion; and

one or more cylinders configured to adjust the first and second portions relative to each other and apportion weight between the primary trailer and the auxiliary dolly wherein the one or more cylinders comprise loading cylinders configured to apply and adjust vertical forces to apportion weight; and

a sensor that monitors weight being apportioned between the primary trailer and the auxiliary dolly, wherein upon sensing excess weight being applied to either the primary trailer or the auxiliary dolly, the sensor causes the one or more cylinders to adjust the first and second portions of the auxiliary dolly relative to each other and thereby reapportion weight between the primary trailer and the auxiliary dolly.

2. The auxiliary dolly of claim 1 , wherein the one or more cylinders comprise loading cylinders configured to apply and adjust vertical forces on the first portion of the auxiliary dolly.

3. The auxiliary dolly of claim 1 , wherein the one or more cylinders comprise steering cylinders configured to turn the first and second portions relative to each other.

4. The auxiliary dolly of claim 1 , further comprising a connection device configured to couple the first portion of the auxiliary dolly to a powered tractor.

5. An auxiliary dolly attachable to the rear of a primary trailer, the auxiliary dolly comprising:

a first portion flexibly coupled to a second portion comprising one or more axles with wheels,

wherein the first and second portions are flexible relative to each other, and

wherein based on a feedback that excess weight is being applied to either the primary trailer or the auxiliary dolly, the first and second portions are adjustable relative to each other to reapportion weight between the primary trailer and the auxiliary dolly; and

a sensor that monitors weight being apportioned between the primary trailer and the auxiliary dolly, wherein upon sensing excess weight being applied to either the primary trailer or the auxiliary dolly, the sensor causes loading cylinders to adjust relative vertical forces between the first and second portions relative to each other and thereby reapportion weight between the primary trailer and the auxiliary dolly.

6. The auxiliary dolly of claim 5 , wherein the loading cylinders are coupled between the first and second portions.

7. An auxiliary dolly attachable to the rear of a primary trailer, the auxiliary dolly comprising:

a first portion attachable to the primary trailer, a second portion comprising one or more axles with wheels, and a pivot point at which the first portion is coupled to and movable relative to the second portion; and

one or more cylinders configured to adjust the first and second portions relative to each other and apportion weight between the primary trailer and the auxiliary dolly wherein the one or more cylinders comprise loading cylinders configured to apply and adjust vertical forces to apportion weight; and

a steering system configured to straighten the second portion relative to the first portion when the auxiliary dolly is moved in reverse.

8. The auxiliary dolly of claim 7 , wherein the one or more cylinders comprise loading cylinders configured to apply and adjust vertical forces on the first portion of the auxiliary dolly.

9. The auxiliary dolly of claim 7 , wherein the one or more cylinders comprise steering cylinders configured to turn the first and second portions relative to each other.

10. The auxiliary dolly of claim 7 , further comprising a connection device configured to couple the first portion of the auxiliary dolly to a powered tractor.

11. An auxiliary dolly attachable to the rear of a primary trailer, the auxiliary dolly comprising:

a first portion attachable to the primary trailer, a second portion comprising one or more axles with wheels, and a pivot point at which the first portion is coupled to and movable relative to the second portion; and

one or more cylinders configured to adjust the first and second portions relative to each other and apportion weight between the primary trailer and the auxiliary dolly; and

a sensor that monitors weight being apportioned between the primary trailer and the auxiliary dolly, wherein upon sensing excess weight being applied to either the primary trailer or the auxiliary dolly, the sensor causes the one or more cylinders to adjust the first and second portions of the auxiliary dolly relative to each other and thereby reapportion weight between the primary trailer and the auxiliary dolly;

wherein the one or more cylinders comprise loading cylinders and steering cylinders.