Unless I'm working suspension related or anything that requires tire removal, I utilize my RaceRamps. I own (4) 4" blocks and (2) 8" blocks, which have load rating of 1,500 lbs. each. They also work great for storage, since they have a radial cut for the tires. The plus side, you can stack them in any configuration, which is nice. They are 12" square, plenty of tire contact surface. I'll even use a combination stacked under my vehicles if utilizing a jack stand as a safety block, in the event a jack stand seam weld should ever fail. Safety first! I bet all 6 blocks I own, weigh less then 10 lbs. total, which make them easy for transporting, or storage.

This photo is one 4" RaceRamp.