Tractor wont move with brakes released

Check that the 2 wheels that aren't spinning don't have frozen brakes still. If all the brakes are free, you're stuck. Chain up, throw sand or get a pull out of there.

 

Ive had tires frozen to the ground a time or two.

 

Maybe see if you can adjust and back the brakes off until you see a space between the pads and drum of the axle that is not spinning.

 

What truck? My hill start assist solenoid died not long ago (on a bracket underneath the 5th wheel on my Volvo). It started doing that, locking up now and then. $100 part, easy fix.

 

You still didn't answer the question. What kind of truck, what year, etc.

 

You're probably stuck then.