Quote Originally Posted by JeepLab View Post
They don't. The sides of each truss is .130 and the top is 1/4 steel. Total weight of the front is under 11 lbs.

The rear is smaller, so will be less.

I didn't notice any difference in drivability with them installed. You don't even know they are there.
I concur, these aren't terribly heavy and the benefits are tremendous. Both of mine came in one box and I was able to pick it up easily (was prepared for something heavy). I'm pretty sure that the welds give it the necessary strength.