For me wood was way too heavy and bulky. I had 4 to 5 sets of 10 Lynx blocks. At 8 inches wide they were plenty large enough for my 19.5 inch tires. I have seen them used many times with 22.5 inch tires also. You do have to use a set-up for each dual of course.
I would break one from time to time and considered that a cost of travel.
Towards the end of my full timing, I got older, grouchier, and much less tolerant of sites that my hydraulic levelers couldn't handle and I didn't need nearly as many sets of Lynx blocks.
This is what they look like
HEREIf you were to store an RV for a month sitting on them for more I would recommend using the "Lynx Caps"