Long Travel BS Thread

From my knowledge, most all of the above.
Weight distribution:
Most all trucks, even LT, will jump nose down due to the engine being mounted over the front wheels. Bed looks mostly empty so it will naturally be pushed up higher hitting the same bump the front did.
Spring rate:
Not to say your leaves are too stiff, I can’t tell that from one video where I can’t see the rear axle move and hit the bump, but again with a relatively or empty bed (that as you said is designed to carry additional weight) the springs will most likely be overly stiff for this specific purpose of absorbing a bump or off a jump lip.
You could have a very low spring rate, but then adding even 100lbs to the bed would make it sag for towing, loads, or even offroad driving.
Tuning shocks:
Again, I can’t tell this from the video. I’ve no idea if the rear suspension bottomed out over the jump face or hardly compressed. Too soft or too firm valving could cause the tear end to buck up over bump(s).
Throttle:
Generally it’s a good idea to have moderate throttle off the face of a jump, on bikes, trucks, quads etc.
Chopping the throttle right before will cause the nose to dive more than steady moderate throttle.

Overall, leaf spring trucks that have motors in stock location, which is 90% of trucks, will always nose dive a bit. Lots of weight like multiple spare tires, fuel cells, even lead bricks (I’ve seen it before) over or behind the rear axle will help combat this and help them jump more level.

Another factor: jump lip length
In general, finding a lip that is at least as long as the trucks wheelbase is from bottom to top is preferred, that way the front axle doesn’t start to dip before the rear axle has begun to hit the same lip.

see this video of my truck, LT, but still stock motor and leaf springs. It hunts for penny’s on the floor even with a long pretty steep lip/hill at about 40mph.
I definitely need a few hundred lbs out back. To help combat this.
https://youtube.com/shorts/qFchvGDtt7c?si=P-S50jVaDL1aqgxS

Look up “flight school” from all American sender on YouTube, he has a pretty good series that explains how trucks jump, how to hit certain lips, what plays a factor in how truck move in the air etc.