I recommend staying away from aluminum... if you ever use it in the rocks it will not fare well from the abrasion and gouging that will inevitably occur. Additionally it is significantly less malleable than metal prohibiting easy repair; in fact it is actually more brittle and prone to fracture under sustained, repeated abuse.
Keep in mind, sliders aren't intended to deflect shopping carts but designed to mitigate force measured in tons. I know - you'll never get in that situation - un-huh. I prefer to overbuild in the case I get over my head - the "7 P's" applies here.
Below picture is a sample weld-on slider piece we made for the "show room" to explain the components of what a good slider looks like. Also, I'm not a fan of "bolt-on" sliders, a topic almost as passionate as religion or tires, so I'll defer any explanation of why they fail(ed) in my personal experience (with pinch weld and rocker panel damage to prove it). Incidentally, when putting my truck on the lift, I don't use the frame for support - I use the sliders - they're that strong that they can suspend the whole weight of the vehicle. They may weigh 70-90 pounds per side, but it's flippin' a.r.m.o.r., not sissy bars. If your total weight is an issue, pack less crap - this is protection for your vehicle, not subject to compromise IMHO.
Keep in mind, sliders aren't intended to deflect shopping carts but designed to mitigate force measured in tons. I know - you'll never get in that situation - un-huh. I prefer to overbuild in the case I get over my head - the "7 P's" applies here.
Below picture is a sample weld-on slider piece we made for the "show room" to explain the components of what a good slider looks like. Also, I'm not a fan of "bolt-on" sliders, a topic almost as passionate as religion or tires, so I'll defer any explanation of why they fail(ed) in my personal experience (with pinch weld and rocker panel damage to prove it). Incidentally, when putting my truck on the lift, I don't use the frame for support - I use the sliders - they're that strong that they can suspend the whole weight of the vehicle. They may weigh 70-90 pounds per side, but it's flippin' a.r.m.o.r., not sissy bars. If your total weight is an issue, pack less crap - this is protection for your vehicle, not subject to compromise IMHO.