Uncoupling order, lowering landing gear and air bag suspension?

My process for just dropping a trailer (not at a dock) is,

Back in

Pull red button, leave yellow button pushed in (if your trailer has an automatic dumping suspension)
Once all the air is drained out of the trailer, pull yellow button.

I unlock my 5th wheel right off the bat, mainly because if the kingpin is wore out the 5th wheel might not unlock and you'll have to back up until you hear it "thunk".

Lower landing gears all the way in high gear then about 15 turns in low gear. If it's empty, leave about an inch from the dolley pad to the ground.

Disconnect air/electric

Release parking brake, dump air and go

 

By the book.

Reality is many places lock in the trailer, so chocking may not be necessary. If you are dropping and hooking, then you do not crank the landing gear all the way down, rather just until the foot touches the ground. With regards to the order of gear, fifth wheel and hoses, as long as you do it in the same order all the time. That way you will not miss a step. If you are concerned that you will skip something, always do fifth wheel last. That way you won't drop it on the ground nor will you tear your air lines. As far as verifying that the gear is supporting the trailer, you will know after a few times of doing it.

Good luck

 

I start at landing gear, and work my way forwards. Lower it until it's about 3/4" from the ground. Pull king pin. Disconnect lines. Get in and dump bags. Ease out from under it. I don't bother with chocks, because my trailer has spring brakes on both axles. For the one in ten million chance all four brakes fail at once, I'll spend the day fixing it. When you recouple, air bags aired up. Ensures you won't high hook.

I also don't drop my trailer unless it's empty, and I don't do drop and hook. I'm the yard jockey too.

 

Most importantly make sure you do the process in the same order every time.

When I uncouple a trailer I do it most expensive accident to least expensive accident.

Choke the wheels
Landing gear
Air lines
Pigtail
Release king pin
Visual inspection that all is complete

Get in truck
Dump the air
Push the red brake
Pull away slowly

 

I always drop landing gear first.