I installed monos on the front of my daily together with lowering blocks on the rear.
That was 4 years ago and I never looked back.
They are anything but stiff after thorough break in!
One leaf only gets really bouncy and quality gas shocks are a must.
I drive city, freeway, dirt roads, sometimes with loads and never once bottomed out.
They meet and far exceed original spring specs, which have 10 times higher failure rate.
I would recommend them for a daily truck that gets good use.