I’m also using pieces of plank (45 degree ends). I’m lucky, I can often drive into a site watching the level on the drink tray and find adequate level without any blocks. Of course there are times when I had 3 wheels too low - used the axe to lower the high one. And I’ve resorted to pieces of firewood for a wheel needing a higher lift.
I’ve seen people using a jack under the frame or axel to level in a difficult spot.
I got rid of the ramps I used to use for oil changes - only took one time driving right over a ramp. Now I use the plank pieces or some longer planks.