They make cinder blocks and concrete blocks that look basically the same. Concrete blocks weigh a whole lot more and are a lot stronger. You could use solid concrete blocks. These are what they support houses with.
2x6, 2x8, boxes should work. Only use those to get your you truck higher. I have seen wooden car ramps people have made. I have some ramps made out of some composite that I bought somewhere.
Harbor Freight would be a cheap source for some jack stands.
Landscape timbers are cheap too.