[Motor31]

For a flat fix the jacking situation is pretty simple. You will need a heavy duty hydraulic jack, a little 1 ton light duty job might not get it done. I got a 6 ton hydraulic jack at harbor freight several years ago. It was primarily for the tow vehicle as the front axle does carry 11k lbs. there. I have had good service from it and it did lift the front axle when the tires sank a bit into soft ground one year.

Place the head of the jack on the plate beneath the axle where everything is connected. That is the main weight bearing spot for that axle. Do NOT put the jack against the bare axle tube itself, that will bend it. Jack the axle just enough to get the tire to clear the ground. Do not try to lift any further or move the trailer higher. Also for flat repair it is done when hitched to the tow vehicle. If you put the front jacks down you are putting additional strain / weight on the jack / axle situation since the front parking jacks will end up blocking movement of weight shift for the axle.