Yes I attached a picture below of the legs my dump trailer has. Stops the back of the trailer from dropping and pulling the back of truck off the ground
The other picture is a of a 14 foot trailer (not mine) with a 12 foot you will be even closer to the front. It may put to much tongue weight your truck. You want to balance your loads so most of the weight is carried by the trailer axles or enough tongue weight to keep,it from bouncing on the ball.
I grew up with heavy equipment and have loaded and tied down more equipment than I can count. For me it is a visual thing I just load it up and see how the truck and trailer is sitting and how it feels,going down the road. You shouldn't see alot of bend between your truck and trailer. If it bending pushing the back of truck down making it squat you have to much tongue weight. You will lose steering with the truck and it will push you. If you see it dropping you truck a couple inches your are pry good, if it doesn't drop it at all or lifts it you pry won't have enough. The it will bounce on the tongue and be dangerous as well.
I am trying to say there is no hard fast rule on how you should load it. Drive it up there the way you feel comfortable then step back and check everything and see how it looks. You may have to adjust it a couple times or even turn it around and try again. After the first time you will know for the second and it will way quicker. To many variables to say. I have a 26g as you, but my 14k 16 foot trailer with my 2021 3500 gmc are all different and will react differently to the load.
Hope this help a little, trust you yourself. If it doesn't feel right loading or pulling stop and fix it until if feel comfortable.