Thanks wa8 .... Hubby is not a carpender kind of guy. :/
We might never need them out at campgrounds, but now that we got it here, we know we need them on the driveway here. So, if I am understanding right, we are going to need to use them on all four of the beach tires. It is backed in, and the rear needs to be leveled up to even it with the front of the RV.
So, there are ten in each bag, and each tire will require six of the squares, if I set it up the way they have it pictured on Amazon. So it sounds like I will need three sets.