Metal question

So my work got 8 20ft sticks of 1.5x3 .25 wall I was wondering if this would work for a sfbd

What are you body droping? Sure it's .25 wall thickness but for a mini truck i would suggest using nothing less than 2x3 and for a full size 2x4. some have used smaller tubing with success. It's all about bracing and layout. There is no one way to do a sfbd and just because the wall thickness is thicker doesn't mean it's better. You are going to have some flex in a chassis no matter what...you don't want it to be too stiff. Like i said its all about the layout and bracing...ie. single frame rail, double frame rail, the type of suspension etc. Adam

It's for a Toyota pickup 4 cyl ex cab

It will work if used properly and and you brace things correctly.