all alum truck are great. As long as you designate some breaking points like gorillamaxx said.

For me, my breaking areas are the pillow balls, turnbukle ends, body posts, bumper, bumper mount, and some other stuff that i forget.

Pillow balls i find are the best for breakage points. Because if you ever hit a steel post, or a curb, your tires are gonna be the first ones to touch it. Then the impact would get absorbed into the pillow balls, then turnbukle ends, and then arms. I use UE pillow balls because they have a hex at each end, so even though you snap the head off, you still have a hex on the other side.

but if you buy super tough pillow balls, and super tough turnbukle ends, then you'll be breaking A-arms which for the most part are a part you don't want to break. It's better something cheap and easy to replace gives, than an expensive aluminum a-arm.