Say the springs compressed 10mm for every 25mm of wheel travel and that there is 100mm of wheel travel up to hit bump stops when at std height. That means the spring would compress 40mm at std height or 60mm on 50mm lift before hitting bump stops. 60/40 = 1.5 or 50% more force (or weight) to hit bump stops with the same rate spring which of course would have to be longer to provide the lift. You would need a spring 1/3rd lighter to get the same amount of suspension travel. Probably very nice for rock hopping but not suitable for road travel.
It's stupid. No. Dangerous. Unless you contantly have 1 tonne on board. Don't lift. Jeep springs are progressive5/8ths wire. IM springs 7/8 non progressive apparently unpredictable when loaded and have almost zero droop when car is dropped back down... No spec sheets and the company appears to be not a company but privately owned and without a legal team... They need one of them I recon.
And we need to know how many have died for a cheapo lift kit. Literally.