Even if it there were not needed for the driveway, you will need them for campgrounds where the camp area is not perfectly level and flat.
You can buy a box of RV leveling blocks but they will be plastic and can easily break. I was able to find some scrap 2x8 boards and made my own. I cut them about 1' long, beveled one side and reinforced the wood with threaded rods across the grain. They have held up for many hundreds of uses. I frequently need to stack them 2 or sometimes 3 layers high so I carry 6 blocks. On occasion I have used them all but never needed more.
