i am a desert and dune fan as well. so i do it all the time. and i break things all the time. you cant help it. even baja trucks break.
anyway, on sand dunes the damage is less because the landing strip is softer. as mentioned above, the way you land plays the biggest role. the goal is to try to land on all four to distribute the load.
axle trusses are a must. this stops the ball joints from ripping out and/or breaking the housing. welding the axle tubes (if done correctly!) can help a whole bunch. good bumpstops, shocks, and springs are a must. the damage comes when the diff slams into the frame, so that impact needs to be softened as much as possible.
on my old truck that i sold, i had a four inch lift (cant remember the make), double rancho 5000s all aound and home made trusses. it stood up to alot of abuse. but eventually i broke the front diff--twice!! IMO, having 1 ton gear helps, but not much, it just means that you are heavier and will land harder. when jumping light and strong is the key, but that gets expensive.
right now, i will not jump on anything except soft sand.
i am trying to build a home-made desert racer, but am getting in over my head, because i want to modify the frame to get more travel in the front and rear.....i dont know....problems.....problems......
Knife.
knife.coloradok5.com