Working backwards, I have a 22 ft Class C and don't have a chock for the wheels....I put the parking brake on when I park it. I suppose if I parked it on a big hill...but I don't know wy I would do that.
I use the orange blocks. It is easier to lift either of the wheels on the front end of course because those are single wheels. It takes twice the blocks to lift the wheels in the back but it is doable and becomes easier with practice. Even tired after driving all day, you can get pretty good at guessing how many blocks it take to make the bubbles go back in an acceptable range. I am setting up by myself most of the time. Again you get better and better at stopping on the center of the top block, in the mean time you get to climb in and out of the drivers seat checking and double checking if you are centered enough.

If I know that I am going to be parked for a week I might level up small differences that for an overnight I don't bother with. If the site is too uneven I will go find a better site. The other advantage we have is that we have short vehicles and have more options within a site that might have some issues.
I remember a mini GTG with BJ at a state park with few level RV sites...luckily it was an off season and BJ and I both got to hunt before we landed.
I would think that the lumber pieces you mentioned would work just fine but I have limited linear storage and for me the blocks do fine.
