For the wheel that goes in the jack, I use a Reese Towpower Dock Chock, or something like that. Works perfect and is cheap.
I use the lynx leveler blocks. I like them because a set of 10 is compact. I don't have room for boards, although boards work just fine. I don't think I've ever had to raise the camper more than 3" but that all depends on where you camp.
I don't chock the wheels that are raised because you can't with the lynx blocks. With a longer board you could. On the non-raised side I use a homemade chock that I found here: http://www.popupportal.com/index.php?topic=55599.0
which works great. Note that I didn't bother with the dado cut, I just used extra screws at the joints and they work fine.
Avoid the cheap lightweight plastic chocks as they are useless. If you want regular wheel chocks solid rubber kind you can buy for around $8 at Harbor Freight are good. But the above homemade wheel chock works best at stopping camper motion.